SAP R/3 форум ABAP консультантов

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Use
You can use the Formula Builder to implement methods for Business Add-Ins without writing a single line of ABAP code. The methods are implemented by means of socalled formulas.

This type of implementation does not require you to have programming knowledge. However, the functions it offers are more restricted than if you implement a method by writing ABAP code. If the range of functions provided by the Formula Builder is not sufficient, you can change the implementation type of the method at any time.

Features
A formula can consist of the following steps:

Condition
You define a Boolean formula expression whose result can be true or false. This formula expression is a logical condition based on the importing and changing parameters of the method. Depending on whether the condition is true or false, the system triggers different steps. If you do not specify a dependent step for one of these two possibilities, the system continues with the next superior step.

Substitution
The system replaces the value of a specific parameter with another value which you define as a constant value or by means of a mathematic formula. Substitution is only possible if the method contains changing, exporting or returning parameters.

Message
The system issues a message. All messages issued are collected in a log table. You define the message variables as constant values or by means of mathematic formulas. The system can only issue a message if you created a log table during method definition.

Exception
The system exits the method. No further steps are executed, and the application program continues in accordance with the exception defined. You can additionally display a message whose variables you define as constant values or by means of mathematic formulas. An exception can only be triggered if the method contains exceptions.

A formula editor is available which you can use to enter formula expressions. After starting the formula editor, you can display information on how to use it by choosing the pushbutton next to the status display (traffic light).

Activities
You implement the method using the BAdI Builder. For information on this topic, see Implementing Business Add-Ins. To implement a method as a formula, choose the Formula implementation type on the Interface tab. Double-clicking the method name takes to to the Formula Builder: BadI Implementation screen.

You can change the implementation type of the method on the Interface tab. You can implement a method both using a formula and using ABAP code. At the runtime of the application program, the system executes the implementation type currently chosen.

You create the necessary steps in the left section of the screen. To do this, choose and then select the appropriate step type from the dropdown list. Using the other icons available or the context menu (which you can call by clicking the right mouse button), you then determine the arrangement and the descriptions of the steps. You can also copy steps to use them as templates for other steps, or you can delete individual steps.

To specify the parameters for the individual steps, double-click the corresponding entry in the left section of the screen. You then enter the data required in the right section of the screen.

The formula builder has two modes: Standard and expert mode. In the standard mode, you can only enter the formulas using the pushbuttons and by double clicking on functions and fields. In the expert mode, however, you can enter formulas directly. You can also toggle between the tow modes when entering a formula.

The company code field (0COMP_CODE) is not included in your data target or InfoSource. However you can determine the company code from the first four character spaces of the cost center (0COSTCENTER).

You create the following formula for this purpose:
SUBSTRING( cost center, '0' , '4')

Syntax:
SUBSTRING( String, Offset , Länge )

Step-by-Step Procedure in Standard mode:
In the transformation library, on the right hand side under Show Me, choose the category Strings. From the list, select the Substring function by double-clicking on it. The syntax of the formula is displayed in the formula window: SUBSTRING( , , )
The cursor automatically appears over the first parameter that needs to be specified.

From the list on the left-hand side of the screen, choose the Cost Center field by double-clicking on it.
Place the cursor where you want to enter the next parameter.
Enter the number 0 using the Constant button (for the Offset parameter). The commas are added automatically.
Place the cursor where you want to enter the next parameter.
Enter the number 4 using the Constant button (for the Length parameter).
Choose Back. The formula is now checked and saved if it is correct. You receive a message if errors occurred during the check, and the system highlights the erroneous element in color.