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Question

Hi,
I added a screen with some fields using BDT. My question is how do I program the fields dependency using CHAIN ENDCHAIN. For instance I have field1 and field2 (both input fields) and I want field2 to be disabled if field1 has not been selected.
May someone give me a simple example?
Thank you in advance
Regards,
Ahmat

Answer 1

Hi
CHAIN/ENDCHAIN statament is used in PAI process for validations and in this process you can't change the attributes of an input field: You have to do it in PBO process.
Now the problem is what SELECTED means for you.
Anyway in PBO you can insert a module like this:
PROCESS PBO
MODULE DISABLE_FIELD2.
MODULE DISABLE_FIELD2.
  CHECK FIELD1 IS INITIAL.
  LOOP AT SCREEN.
    IF SCREEN-NAME = 'FIELD2'.
      SCREEN-INPUT = 0.
      MODIFY SCREEN.
    ENDIF.
  ENDLOOP.
ENDMODULE.
In PAI process you insert the validations:
PROCESS PAI
CHAIN.
  FIELD: FIELD1,
         FIELD2 MODULE CHECK_FIELD1_FIELD2.
ENDCHAIN.
MODULE CHECK_FIELD1_FIELD2.
IF NOT FIELD1 IS INITIAL AND
   FIELD2 IS INITIAL.
MESSAGE I208(00) WITH 'Fill FIELD2'.
LEAVE SCREEN.
ENDIF.
ENDMODULE
Max