ABAP - Screen Field Validation Using Chain Endchain.

Description:

There are many ways to validate fields that are created on a dynpro of a dialog screen program.

Whether this is to validate a single field of multiple fields at the same time below is a few examples of how this can be coded into a PAI module of the dynpro flow logic.

*Validating a single field on a dynpro screen via a PAI module call

FIELD scr_field-ebeln
MODULE validate_screen_field "ABAP code for validation contained in PAI module
ON INPUT.

*Validating multiple field on a dynpro screen via a PAI module call
CHAIN.
FIELD: scr_field-ebeln, scr_field-ebelp.
MODULE validate_screen_fields. "ABAP code for validation contained in PAI module
ENDCHAIN.

*Validating a dynpro screen field via a direct ABAP table selection
FIELD scr_field-ebeln
SELECT *
FROM ekko
WHERE ebeln = scr_field-ebeln
INTO ekko
WHENEVER NOT FOUND SEND ERRORMESSAGE 001
WITH ' Document Number '
ON INPUT.

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- Drop Down List Box In The Selection Screen.

- Creating Dynamic F4 (Value On Request) Help.

- Express Select-Options Values In SY-LANGU.

- F4 (Value On Request) For Files On Presentation Or Application Server.

- Sample Program On Use Of Selection Screen.