Can we change the value of a variable in the driver program from sapscript?

Question

Hello Experts,
I am currently developing a form wherein I need to change the value of a variable defined in the standard
driver program through the sapscript form. Unfortunately, I cannot customize this standard program since this is used by many other
subsidiaries. So, is there anyway that I can change a variable defined in the driver program via sapscript?
I tried to use a PERFORM to change its value but it is not working.
I hope you can help me guys. Thank you and take care!

Answer 1

SAP SCRIPT:
/: PERFORM GET_ATTNDEE_INFO IN PROGRAM ZHR_TRNG
/: USING &PPVAR-EOBJD&
/: CHANGING &ATTND&
/: ENDPERFORM
Executable Prog.:
REPORT ZHR_TRNG.
FORM GET_ATTNDEE_INFO TABLES IN_PAR STRUCTURE ITCSY
OUT_PAR STRUCTURE ITCSY.
DATA : LOC_CODE(8),
WF_NAME LIKE PA0001-ENAME, "----Location Code
WF_SOBID LIKE HRP1001-SOBID. "----Business Event Code
DATA: BEGIN OF ITAB_ECODE OCCURS 0,
ECODE(8),
END OF ITAB_ECODE.
DATA: NAME1 TYPE STRING.
READ TABLE IN_PAR INDEX 1.
LOC_CODE = IN_PAR-VALUE.
SELECT SOBID FROM HRP1001 INTO WF_SOBID
WHERE OBJID = LOC_CODE AND OTYPE ='E' AND PLVAR = '01' AND SCLAS = 'P'.
APPEND WF_SOBID TO ITAB_ECODE .
ENDSELECT.
IF SY-SUBRC = 0.
LOOP AT ITAB_ECODE.
SELECT SINGLE ENAME FROM PA0001 INTO WF_NAME
WHERE PERNR = ITAB_ECODE-ECODE ." AND ENDDA >= '31.12.9999' .
CONCATENATE 'Mr ' WF_NAME ',' NAME1 INTO NAME1.
IF SY-SUBRC = 0 .
OUT_PAR-NAME = 'ATTND'.
OUT_PAR-VALUE = NAME1.
APPEND OUT_PAR.
ENDIF.
ENDLOOP.
ENDIF.
ENDFORM. "GET_USR_INFO