ARTICLE
Statements in the Screen Flow Logic
The screen flow logic is the procedural part of a
screen . It is created using an ABAP-like
programming language in Screen
Painter on the Flow Logic tab page. The syntax rules of the screen
flow logic are largely similar to the rules for ABAP. In particular, sta
tements are ended using a period, chained statements can be formed, and
the same rules apply for comments. In suitable positions, literals can
be used whose syntax matches that of ABAP literals
and whose value range is determined by the requirements of the current
statement.
The screen flow logic, like ABAP programs, is structured from processing
blocks. Possible processing blocks are the four event blocks for the
screen events PBO ,
PAI , POH , and
POV , which all start with the key word
PROCESS . These event blocks contain a small
set of statements that are described in the following sections, and
which offer the the following functions:
Call dialog modules of the ABAP program using MODULE
Control data transports to the ABAP program and handle
error messages using
FIELD and CHAIN
Execute loops using table controls with
LOOP
Call subscreens using
CALL SUBSCREEN
The statements in the event blocks of the screen flow logic are normally
processed sequentially. Branches result from error handling following
input checks in dialog modules. Screen elements in table form are
processed in loops.
Note
As well as the statements shown here, a range of
obsolete statements for dynpro flow logic
exists.
Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved