Changing the import parameter of User Exit

DM07M is the input parameter of a user exit. Check the image for your information .

Declare a constant with main program in bracket followed by the field you want to change.
Example  : 
Constant : gc_temp type char30 value '(Main program name) Table-field' .

Field symbol : <FS> type table-field .

assign (gc_temp) to <FS> .

move the value required to field symbol.
Move 'Bharat' to <FS> .

Below is the example


  CONSTANTS: gc_ref_fld TYPE char25 VALUE '(SAPMM07M)DM07M-KZCLA' .

FIELD-SYMBOLS: <fs_wa> TYPE dm07m-kzcla.

ASSIGN (gc_ref_fld) TO <fs_wa>.

IF <fs_wa> IS ASSIGNED.
*Do not show the characteristic screen...change to background mode
  MOVE '1' TO <fs_wa>.
ENDIF.