Flow Logic Keywords

Use

You use flow logic keywords to define the flow logic of a screen in the Screen Painter.

Features

You can use the following keywords to define the flow logic of your screen:

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. Can be combined with the keywords MODULE and SELECT
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 in a table
SWITCH	Connects to a switch in the Switch Framework. If the addition `SWITCH` is specified, the dialog module `mod` is called only if the switch specified by `switch` has the state on. Note The addition SWITCH is only allowed in a MODULE statement, but not in a FIELD statement.
VALUES	Defines allowed input values

Note

For more information about screen programming, see ABAP Programming .

Example

The following example illustrates the use of screen flow logic:

Note

*------------------------------------------------

* 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.