IDOC: Incorrect function module problem

Question

Hi,
I am working on inbound IDOC processing. I created an extension for an IDOC. I created custom segment & included it in the extension that I created. The Message type was also custom. (I merely copied an existing standard Message Type for some other purpose). I also assigned Function Module to Message Type & IDOC type. I have other necessary settings configured as required. The problem that I am encountering is as follows:
Incorrect function module IDOC_INPUT_SHPCPR called up
Message no. B1044
Diagnosis
The function module IDOC_INPUT_SHPCPR, which was called for the application input, was not able to process the IDoc. A possible cause is that the IDoc has wrong message type or IDoc type.
Procedure
Please check the message type assignment for the application function module in the ALE customizing.
Now to troubleshoot the above error, I made sure that I have an entry with FM. IDOC_INPUT_SHPCPR,  IDOC Basic Type ,custom  IDOC extension & custom Message Type. But even then I see the above error. This error appears as Status 51 for the test IDOC that I processed.
Can anyone please tell me how to solve this? Thanks in advance.

Answer 1

On line 49 of the function module :
* Loop through the IDocs' control records
  LOOP AT idoc_contrl.
*   Check the IDOCs message type
    current_mestyp = idoc_contrl-mestyp.
    PERFORM idoc_message_type_check
                 TABLES   idoc_status
                 USING    idoc_contrl
                          mestyp-shpcpr
                 CHANGING subrc.
Perform looks like this ( in Include LV56IF0C...)
FORM idoc_message_type_check
          TABLES   t_idoc_status  STRUCTURE bdidocstat
          USING    f_idoc_contrl  STRUCTURE edidc
                   default_mestyp LIKE edidc-mestyp
          CHANGING subrc          LIKE sy-subrc.
  IF current_mestyp <> default_mestyp.   " Here the variable default_mestyp has the value SHPCPR
    MESSAGE ID      msg-id             "Global variable
            TYPE    'E'
            NUMBER  msg-nr_wrong_function    "Global variable
            WITH    current_mestyp     "message type
                    'IDOC_INPUT_SHIPPL'"Your function module
                    f_idoc_contrl-sndprt     "Sender partner type
                    f_idoc_contrl-sndprn     "Sender number
            RAISING wrong_function_called.
Again let me warn you that you will have to copy the entire function group V56I. Copying the function module alone will not help because there are many reusable subroutines in different includes of the function-pool.
regards,
Advait