Calling a standard subroutine and setting global fields

Question

Hallo ...
I am calling a subroutine in program A(standard program ) from a  program B .   there are a set of global fields in program A  that i need to first set before i call this subroutine from Program B. is it posible to set these fields from program B. (since i cannot do much on the program A side as it is standard).?
Can some one suggest how can set these fields . some of these fields are flags and some normal fields. Not all the fields have parameterd ids. any idea how can i set thses fields from program B ?????
Help will be appriciated
Thanks

Answer 1

Hello,
there are two choices:
(1) You can add a form to program A, if the standard program lets you implement user-defined code. For example, in program SAPMV45A you use a certain include to implement user-defined forms. You can define a form which takes the actual values of the fields in program A which you want to change as parameter. The form then changes the fields (from within the form, the fields are visible and changable). You can call this form by using PERFORM your_form IN program_A.
(2) You can use a "dirty assign": Refer to the F1 help of the ASSIGN statement for more information about that. Sample may look like this (note the brackets and apostrophes):
ASSIGN ('(PROGRAM_A)GLOBAL_FIELD') to <fs_proga_global_field>.
However, the assign only works when program A has already been loaded into the internal mode during runtime. This means before doing the ASSIGN, any code of program A must have been executed in the current internal mode.
Hope this helps,
David