Subroutine-the actual parameter is incompatible with the formal parameter

Question

Hi,
I have the following code that is outputting an error message during activation:
DATA: I_RESBB TYPE TABLE OF RESBB,
      WA_RESBB TYPE RESBB.
PERFORM OBTAIN_RESBB_DATA
USING I_RESBB.
*&      Form  OBTAIN_RESBB_DATA
*       text
*      -->P_I_RESBB  text
FORM OBTAIN_RESBB_DATA  USING    VALUE(P_I_RESBB) TYPE RESBB.
ENDFORM.                    " OBTAIN_RESBB_DATA
However, I am getting the following messages during activation:
In PERFORM or CALL FUNCTION "OBTAIN_RESBB_DATA", the actual parameter
"I_RESBB" is incompatible with the formal parameter "P_I_RESBB".
What am I doing wrong? I have checked through many different threads & sites but can't find a solution.
Thanks,
John

Answer 1

John, since you seem quite familiar with the ABAP help and obsolete statements I'm now surprised what you were initially asking for.. .
Anyhow, below a sample coding with the table being passed as a USING parameter. Avoid using VALUE on the parameter (i.e. pass by value) unless you need a copy of the parameter. Otherwise this leads to a performance overhead (requirement to copy the parameter), especially for large internal tables.
TYPES T_RESBB_TAB TYPE STANDARD TABLE OF RESBB WITH NON-UNIQUE DEFAULT KEY.
DATA I_RESBB TYPE T_RESBB_TAB.
PERFORM OBTAIN_RESBB_DATA USING I_RESBB.
FORM OBTAIN_RESBB_DATA  USING I_RESBB TYPE T_RESBB_TAB.
  FIELD-SYMBOLS: <RESBB> TYPE LINE OF T_RESBB_TAB.
  LOOP AT I_RESBB ASSIGNING <RESBB>.
    " Additional coding for evaluating/updating the table
  ENDLOOP.
ENDFORM.
Cheers, harald
P.S.: Update of my posting: Just read your one comment. Looks like your only problem was attempting to define the table type in the parameters section of the form routine. This doesn't work. If you don't have a type you could use a generic type (i.e. simply just say <i>using i_resbb type table</i>), but in general I would stick to strong typing unless you have a generic routine that must handle different table types. So simply refer to a table type from dictionary or that you defined in your program.