When implementing a customer exit (i.e. field, user etc) have you ever wanted to be able to read additional field values available in the main SAP program but not available in your exit. Now with the use of field-symbols you can have access to any field available in the main SAP program. The code below demonstrates how this is done within a field exit on BSTNR which can be tested using transaction ME21. Information on creating field exits can be found here.
FUNCTION field_exit_bstnr. *"---------------------------------------------------------------------- *"*"Local interface: *" IMPORTING *" REFERENCE(INPUT) *" EXPORTING *" REFERENCE(OUTPUT) *"---------------------------------------------------------------------- * create field symbol FIELD-SYMBOLS: <status>. * Assign value of variable from calling prog to field symbol ASSIGN ('(SAPMM06E)RM06E-BSART') TO <status>. * Display value retrieved in message * Note: Messages of type i and w are not allowed IF sy-subrc = 0. MESSAGE e003(zr) WITH <status> 'kkk'. ENDIF. ENDFUNCTION.