Flow Logic Keywords (SAP Library - BC - ABAP Workbench: Tools)

Flow Logic Keywords

You define the flow logic in the flow logic editor of the Screen Painter, using the following keywords:

Keyword	Description
CALL	Calls a subscreen.
CHAIN	Starts a processing chain.
ENDCHAIN	Ends a processing chain.
ENDLOOP	Ends loop processing.
FIELD	Refers to a field. You can combine this with the MODULE and SELECT keywords.
LOOP	Starts loop processing.
MODIFY	Modifies a table.
MODULE	Identifies a processing module.
ON	Used with FIELD assignments.
PROCESS	Defines a processing event.
SELECT	Checks an entry against a table.
VALUES	Defines allowed input values.

For more information about transaction programming, see the ABAP User’s Guide

Example of Flow Logic Example

The following example shows some use of screen flow logic:

*------------------------------------------------
* Sample Code
*---------------------------------------------------
*Processing Before Screen Output
PROCESS BEFORE OUTPUT.
MODULE INIT_FIELDS.
* Self-programmed F1 Help
PROCESS ON HELP-REQUEST.
FIELD GSSG-BUKRG MODULE V-BUKRG.
* Processing after user input
PROCESS AFTER INPUT.
* Lock customer master record
CHAIN.
FIELD GSSG-KTNRG
MODULE ENQUEUE_CUSTOMER_MASTER.

* Read customer master record
MODULE READ_CUSTOMER_MASTER.

* Read business area
MODULE READ_GSSG.

ENDCHAIN.
* Process function code
FIELD OK-CODE MODULE OKCODE ON INPUT.