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Note 842318 - FAQ about validations + substitutions



 
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PostPosted: Mon Aug 10, 2009 11:25 am    Post subject: Note 842318 - FAQ about validations + substitutions Reply with quote

Note 842318 - Frequently asked questions about validations + substitutions

Summary

Symptom
This note deals with frequently asked questions about validation and substitution maintenance.

Solution
I. Creating, activating and transporting validations and substitutions

1. Which transactions are required to use validation or substitution functions?

GGB0 Validation Maintenance
GGB1 Substitution Maintenance
GCVZ Rule Maintenance
GGB4 Select action for validation/substitution, for example, activation of application areas, message usage or substituted fields
GCX2 Definition of Includes for User Exits

OB28 Activation of FI validations
OBBH Activation of FI substitutions
OBBZ Activation of cost of sales accounting substitution (in the FI area)
OKC7 Activation of CO validations
OKC9 Activation of CO substitutions

GCT9 Transport: Validations
GCT0 Transport: Substitutions


2. What must I take into account when using the formula editor?
a) Validation GGB0

If you create the first validation for a callup point, for example 'Financial ccounting - document header', you must define a message class. This is then valid for ALL validations for this callup point.

Not all fields can be used for validations for certain callup points, for example 'Complete document in FI'. This is because there are several rows and it is not clear on which row the check is to be carried out. You can only use numeric fields here. (Note 413956)
You should use a user exit if you need more checks on this callup point.

b) Substitution GGB1

If you create a substitution, for example "Financial accounting - document line item", only certain fields are authorized for the substitution. This is because it may lead to problems with the documents or inconsistencies between different applications.
It is possible to release more fields for substitution. However, this can be critical, as serious problems can occur as a result.
This is why you should regard the following change as a modification (Note 170183):
The table GB01 contains information about which table fields can or cannot be substituted for which callup point.
A field can be substituted if you change the field BEXCLUDE to ' '.

For example: 'Complete document' callup point in FI
As standard, no field is released for substitution for this callup point. You can see this in the following entries:

BOOLCLASS CLASSTYPE BCLTAB BCLFIELD BEXCLUDE
015 S BKPF * X
015 S BSEG * X


BOOLCLASS - Specifies the Boolean class. This is determined in the application area and callup point in each case, for example:
008 - Document header (FI)
009 - Line item (FI)
015 - Complete document (FI)
016 - Cost of sales accounting
100 - Document header (CO)
CLASSTYPE - Specifies if the field can be used for validations (B), substitutions (S) or both (A).
BCLTAB - Table that is used
BLCFIELD - Field of this table
BEXCLUDE - Can be used ' ' or cannot be used 'X'.

As mentioned above, you should regard this change as a modification. Problems that occur as a result of this change cannot be handled in 'standard' support.


3. What must I take into account when activating validations or substitutions?

You can activate validations and substitutions in two ways.
Activation level: 1 - Active
2 - Active, except during 'batch input' processing

Because the activation in financial accounting (FI) is company code-specific, you should activate the validations or substitutions in both company codes in the case of cross-company code transactions.


4. What must I take into account when transporting validations or substitutions?

Usually, only table entries are transported when validations or substitutions are transported. The generated source code should not be transported, as this can cause problems. After the import into the target system, the source code is generated automatically when you start the report RGUGBR00 is started.

If you want to delete a validation/substitution, and do not want to do this in each system individually, proceed as described in Note 840981.


II. Using user exits in validations or substitutions


1. Where can I maintain user exits for validations and substitutions?

The exits for validations and substitutions are stored in an include of your choice.
The following includes are delivered as examples by default:
RGGBR000 Val/Sub: Exits for rules
RGGBS000 Val/Sub: Exits for substitutions
You should copy these into the customer namespace, for example ZGGBR000.
The length of the name you choose should not exceed 8 characters. This is because the name is also generated in the source code, and it may exceed a certain line length.
You can also create a separate include for each client, which can improve performance.

In transaction GCX2, you should then define where your include is used. To do this, enter the name of your include as a FORM pool in the relevant application area.

2. How should I create a user exit?

Define your user exit in the FORM routine GET_EXIT_TITLES with the correct exit type (EXITS-PARAM). You can use the existing sample entries as a template for this.

The exit types required in the FORM routine GET_EXIT_TITLES are organized as follows:

C_EXIT_PARAM_NONE No parameter

Apart from the return value (B_TRUE or B_FALSE), you do not need any parameters for the validation. If you do not want to substitute a field, use this parameter in the substitution (select "Only exit").

However, you must then use a TABLE statement in the FORM pool (not in the actual form) to identify the relevant structure.


C_EXIT_PARAM_FIELD A Field is transferred as a parameter

You only use this type in the substitution. Exactly one field is substituted. Enter user exits of this type in the substitution maintenance instead of assigning a constant value.


C_EXIT_PARAM_CLASS A complete type is transferred as a parameter

Matrix validations/substitutions ("Only exit"). This exit type can only be used for callup points with complete documents, for example in FI and LC. You cannot use this exit type for any other callup points. The transferred type contains all information about a class. An example is the use of the document header and all corresponding line items in the FI area.

In the FORM routine GET_EXIT_TITLES, change the fields NAME and TEXT of the internal table EXITS to the values you want.

Use one of the sample routines as a template and copy these to the names you selected. You can now implement the functions you want in this FORM routine.
After you have finished creating the user exit, you can use it in your validations or substitutions.

3. What must I take into account when implementing the user exit?

No dialog boxes, warning messages, information or error messages must be issued in an exit, and a "COMMIT WORK" must not be rejected. This would, for example, interrupt the batch processing or cause problems with the documents to be posted. If you find a serious error in the field contents in the exit, send a termination message (A or X), which will ensure that the transaction is terminated.

Do not use any ABAP commands that cause you to leave the exit directly, for example 'LEAVE (TO) SCREEN ...' or 'SUBMIT <REPORT> ...' or 'CALL TRANSACTION ...'

In an exit, use only structure fields that belong to the Boolean class of the calling substitution, validation or rule. The other structure fields are not filled or are not filled properly for the callup point of the calls of the substitution, validation or rule.

You may make changes to field contents in a substitution exit only if this field can be substituted in the Boolean class. You can display these fields by choosing "Add entry" in the substitution maintenance.

In the includes of the substitution exits, you must not use the commands MODIFY, INSERT or DELETE in the internally used structures such as BSEG or BKPF. These structures are interpreted internally as database tables because they are defined by a TABLES statement. As a result, the system writes, deletes or changes database records if you use the commands mentioned above. This can cause serious inconsistencies and problems in the document processing.

If you want to change field contents in the exit type C_EXIT_PARAM_CLASS, you should make the changes in the internal table BOOL_DATA (for example BOLL_DATA-BSEG).

III. Problem analysis

1. What must I take into account before I analyze the problem?

Before you analyze a problem with validations/substitutions, make sure that the generated source code is up to date. You can use the report RGUGBR00 to do this.
Call this report in transaction SE38. You see the following selection screen:

Application area ' '
Application callup point ' '

' ' Regenerate main program
' ' Generate table file
' ' Generate rules
' ' Generate validations
' ' Generate substitutions
' ' Generate sets
' ' Generate rule use
' ' ' Generate validation use
' ' ' Generate substitution usage
' ' ' Generate substitution export routines
' ' Generate substitution routines in all clients
' ' ' Generate trace program calls

Now update the source code for the application area and application callup point in which the validation or substitution was created.
To do this, enter the application area, for example FI, and the application callup point (0003/complete document), and set all indicators except for 'Generate substitution routine in all clients' and 'Generate trace program calls'. Then execute the report.

The source code is now at its current status.


2. How can the validation and substitution trace be used?
a) Validation trace
You created and activated a validation.
You can now activate the trace, for example in transaction GGBO. To do this, select the validation and choose 'Extras -> Activate trace'.
Example:
You created an FI validation for the callup point 'Line item'. To test the validation, call transaction FB01, for example. The trace is displayed as soon as the validation has run. You can now see different things in the trace, for example the values contained in the fields of the various structures. From this, you can see whether additional checks are required, or what the cause of a problem is.

b) Substitution trace
Activate the trace in the same way as you activate validations.
Example:
You created a substitution in the same way as you activated the trace for the validation described above. The trace for substitutions has an additional function, in that you can view the field contents before and after the substitution. There, problems can be reproduced in the same way.


3. How can I use the Debugger to analyze a problem?
a) Basic information
All includes for validations and substitutions are created in this form: GBTmmaa0.
mm stands for the two-digit client key.
You can use the function module G_CLIENT_ENCODE to convert a three-digit client (>099) to a two-digit client, for example, client 100 --> AA
client 800 --> TQ
AA stands for the application area, for example FI --> Financial Accounting
CO --> Cost Accounting
You will find this abbreviation in the maintenance transaction.
Therefore, GBTAAFI0 is the include in client 100 for FI validations and substitutions.


b) Structure of the includes and FORM routines for validations and substitutions and tips on how to debug

The includes listed above are structured as follows (sample include in FI, Client 800):

INCLUDE GBTTQFIA. " Rules
INCLUDE GBTTQFIB. " Substitutions
INCLUDE GBTTQFIC. " Substitution conditions
INCLUDE GBTTQFID. " Validations
INCLUDE GBTTQFIE. " Validation conditions
INCLUDE GBTTQFIF. " Validation checks
INCLUDE GBTTQFII. " Application rules
INCLUDE GBTTQFIJ. " Subst. export routines
INCLUDE GBTTQFIM. " Trace/simulation
INCLUDE GBTTQFIS. " Subst. import routines


c) The form routines for validations have the following sample structure (sample validation with the name VAL01):

FORM VAL_VAL01.
G_BFOUND = B_TRUE.
DATA: COND LIKE D_BOOL,
CHECK LIKE D_BOOL,
NVALSEVEREST LIKE SY-SUBRC VALUE -1.

G_STEP = '001'.
PERFORM VALCOND_1VAL01##001
CHANGING
COND.

IF COND = B_TRUE .
PERFORM VALCHCK_2VAL01##001
CHANGING
CHECK.

IF CHECK = B_FALSE .
PERFORM MESSAGE_OUTPUT
USING
" ...message parameter
CHANGING
NVALSEVEREST.
ENDIF.
ENDIF.
ENDFORM. " VAL_VAL01

The statement G_STEP = '001' indicates the step that is executed.
The prerequisite of the step is defined in the FORM routine VALCOND_..., and the FORM routine VALCHCK_... checks the validation step.

To analyze this step, you should create breakpoints on these two PERFORM statements and also on the code line 'IF CHECK = FALSE'. This allows you to determine whether your prerequisite or the check is causing the problem, for example if a field that is to be checked does not contain the value that you expect.


d) The FORM routines for substitutions have the following sample structure (sample substitution with the name SUB01):

FORM SUB_SUB01.
G_BFOUND = B_TRUE.
DATA: COND LIKE D_BOOL.
G_CLASSID = '009'.
G_SUBST_PERFORMED = B_FALSE.

IF G_TAB_FLAG-BSEG <> B_TRUE .
PERFORM READ_MASTER_DATA
USING
'BSEG'
G_BFOUND.
IF G_BFOUND = B_FALSE .
MESSAGE E083 WITH 'BSEG'.
ENDIF.
ENDIF.

G_STEP = '001'.
PERFORM SUBCON_3SUB01##001
CHANGING
COND.

IF COND = B_TRUE .
BSEG-SGTXT = 'This is a Test'. " Text
G_SUBST_PERFORMED = B_TRUE.
ENDIF.
ENDFORM. " SUB_SUB01

As mentioned above for validations, 'G_STEP = '001' indicates the step, and the prerequisite of the substitution is defined in FORM routine SUBCON_.... The actual substitution is performed by the statements in the structure IF COND = B_TRUE --> ENDIF. These statements vary depending on the type of substitution created (field allocation, constant value, user exit).

In the substitutions, you should also set a breakpoint for the PERFORM on the prerequisite and the statement 'IF COND = B_TRUE'.


4. Function modules that call validations and substitutions

Validations - Function module G_VSR_VALIDATION_CALL
The different structures/tables, the name of the validation, callup point and application area are assigned to this function module.
Substitutions - Function module G_VSR_SUBSTITUTION_CALL
The parameters transferred to validations are also transferred to this function module. However, this function module also returns the structures or tables that contain the changed values.

You could set a breakpoint to analyze both function modules. By doing this, you can see which data was transferred, which data the validation or substitution receives, and which values are returned.


5. What must I take into account when using the set?

When sets are used in validations or substitutions, the system generates source code from the values in the sets.
Performance problems can occur if a set is of a certain size, since the generated source code causes longer runtimes.
This can also cause a runtime error.

To reduce the size of the source code of the sets used, proceed as follows:

Use a smaller set in the validation, substitution or rule. To do this, group single values in the set into intervals (for example, instead of the single values 0001, 0002 and 0003, use the interval 0001 - 0003).

instead of "<value> IN SET" use the rule "( <value> IN SET1 OR <value> IN SET2 )", where SET1 and SET2 together include the values from SET (for example, subhierarchies at the highest hierarchy level).

The simplest way to determine the number of single values or intervals in a set hierarchy is to execute the program RGSEX000.
Enter the name of the set and execute the program. All contained sets and values/intervals are listed and the sequence number of the entries is contained in the first column.


6. Why does a validation or substitution work in the development system, but not work in another system after a transport?

You should make sure that validations and substitutions are activated in the target system. You can also use the report RGUGBR00 to regenerate the source code again.

There could be another cause in substitutions:
You try to substitute a field that is not released by SAP as standard. To substitute a field, you have adjusted the table GB01 in your development system. However, this table was not adjusted in the target system. The generated source code is correct and the value was changed in the substitution, but the change was not returned to the calling application using the export routines.
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