Error Message not getting clear while creation of purchase order

Question

Hi All,
I am facing one problem while creating purchasing order.
I have written one user-exit for purchase order. User has to enter purchase requisition number for certain purchase order type. If he doesn’t enter PR number, we have to throw an error message.
I have used the MM06E005 for the same. User exit is working fine, but the problem is, all error messages are collected in log and it will be displayed in a dialog screen when you check the document (Transaction ME21N).
When I enter PR number and check the document, the error message is still there, system is not clearing the error log. I have created “Z” message class and have used in User exit.
Do you guys have any solution for this? Am I using the right user exit? What should I do to clear the error message?
If you don’t have answer, please pass it to your friends also….
Thanks a lot in advance…

Answer 1

Hi Rob,
Your inforamtion was good enough to start. thanks a lot for that. I tried to implement the same but no luck this time also.
FYI..
The FM exit name is EXIT_SAPMM06E_012 and see the following code, i used.
TYPES:  BEGIN OF type_my,
        subrc TYPE sysubrc,
        msgid TYPE symsgid,
        msgty TYPE symsgty,
        msgno TYPE symsgno,
        msgv1 TYPE symsgv,
        msgv2 TYPE symsgv,
        msgv3 TYPE symsgv,
        msgv4 TYPE symsgv,
        END   OF type_my.
DATA:  my TYPE type_my.
DATA : GV_PO(10) TYPE I.
  if I_EKKO-BSART = 'Z005'.
  GV_PO = I_EKKO-EBELN.
    loop at TEKPO.
      if TEKPO-BANFN is initial.
       message E000(ZBC_MESSAGES) with TEKPO-EBELP.
        my-subrc = sy-subrc.
       my-msgid = sy-msgid.
       my-msgty = sy-msgty.
       my-msgno = sy-msgno.
        my-msgid = 'ZBC_MESSAGES'.
        my-msgty = 'E'.
        my-msgno = '000'..
        my-msgv1 = sy-msgv1.
        my-msgv2 = sy-msgv2.
        my-msgv3 = sy-msgv3.
        my-msgv4 = sy-msgv4.
  Cleaning
        CLEAR:
        sy-subrc,
        sy-msgid,
        sy-msgty,
        sy-msgno,
        sy-msgv1,
        sy-msgv2,
        sy-msgv3,
        sy-msgv4.
  Generate message
        mmpur_message my-msgty my-msgid my-msgno
        my-msgv1 my-msgv2 my-msgv3 my-msgv4.
  Remove message from message list
        mmpur_remove_messages_by_id GV_PO.
      endif.
    endloop.
It is still not working. Moreover i don't have PO number at run time.
I hope this clarify the problem in more detail.
Meanwhile i am searching for OSS as suggested by Michael Bennett.