Help & Value Request In Sap ABAP.

In any transaction, When the user presses F1 or ? on a field, System provides the help facility for that particular field. In dialog program, when F1 is pressed, help provided by R3 system is sourced from data element documentation. If this documentation is not present for that particular field or if user needs to display additional information for that particular field, then user defined help can be provided through PROCESS ON HELP REQUEST.

In ABVP/4 help can be provided to the user by:

Data element documentation: The F1 help can be enhanced, by adding an additional text for the data element in ABAP/4 dictionary.
It can be done with the help of following steps:
Place cursor on the screen field,
GOTO  DOCUMENTATION  DATA ELEMENT DOCUMENT
You can now extend the existing help.
USING THE PROCESS ON HELP-REQUEST.
If you don’t have this event in a program, then the documentation of the field in the ABAP/4 dictionary is taken into consideration. If this event exits in the program then it is executed.

Process on HELP-REQUEST event

This event is triggered when user presses F1 on a screen field. You need to handle this event in flow-logic by specifying the fields and attaching the module to it.

Syntax

PROCESS ON HELP –REQUEST.
FIELD SFLIGHT-CARRID MODULE HELP-FOR-CARRID.
In module pool program

MODULE HELP.
Write : `This is field is from sflight table’
Write : / ‘It is of four Character’.
ENDMODULE.

When the user presses F1 on this particular field, then this message will be displayed on the screen.



Value Request

Whenever the user presses F4 on the screen field list of possible values, particular fields are displayed. If the standard value-help is inadequate or if you want to display additional fields or with different combination of fields, developer can program this in PROCESS ON VALUE-REQUEST event in the flow-logic and subsequent module in the module pool program. When the user presses F4, list of possible values are displayed either from matchcode objects or check table or help view or domain. Each one of them is explained briefly.

Matchcode objects: Are aggregated dictionary objects and detailed procedure to create these objects is explained in the later part of the material.
Check Table: If a check table is assigned to the table field and if the user presses F4 for that particular field, then all the key fields are displayed.
Domain Values: The values defined in the domain are displayed. These values are set in domain when the domain is created in the dictionary.
Help views: In cases where the check table is not sufficient, you can create a help view with this check table, which gives additional information like explanatory text for the fields of the check table.
PROCESS ON VALUE_REQUEST.

Each time the user presses F4 on the screen field, following algorithm is called internally.