Problem with clearing FM - POSTING_INTERFACE_CLEARING

Question

Hello,
We are using the above FM for clearing customer open items against the incoming payments.
This is working fine for some cases.
However for large volume ransactions, this does not work - When executed in background the program gives error "BDC_OPEN_GROUP, group .. is invalid".
Currently we are tyring to clear around 220000 open items against 1 payment document.
This function module works fine for all scenarios, however does not work only for for large volume transactions.
SAP does not provide any assistance for this issue as the function module is 'not released'
Given below is the code that we are using to call the function module:
  CALL FUNCTION 'POSTING_INTERFACE_START'
    EXPORTING
      i_function         = 'C'
      i_group            = l_group
      i_mode             = 'N'
      i_update           = 'S'
      i_user             = sy-uname
      i_xbdcc            = 'X'
    EXCEPTIONS
      client_incorrect   = 1
      function_invalid   = 2
      group_name_missing = 3
      mode_invalid       = 4
      update_invalid     = 5
      OTHERS             = 6.
Clear all the line items.
  CALL FUNCTION 'POSTING_INTERFACE_CLEARING'
    EXPORTING
      i_auglv                    = c_auglv     "value = UMBUCHNG
      i_tcode                    = c_tcode    "value = FB05
    TABLES
      t_blntab                   = t_blntab
      t_ftclear                  = t_ftclear
      t_ftpost                   = t_ftpost
      t_fttax                    = t_fttax
    EXCEPTIONS
      clearing_procedure_invalid = 1
      clearing_procedure_missing = 2
      table_t041a_empty          = 3
      transaction_code_invalid   = 4
      amount_format_error        = 5
      too_many_line_items        = 6
      company_code_invalid       = 7
      screen_not_found           = 8
      no_authorization           = 9
      OTHERS                     = 10.
  IF t_blntab[] IS INITIAL.    " sy-subrc <> 0.
    w_flag = 'X'.
    w_indicator = 'U'.
  ELSE.
    CLEAR w_flag.
    w_indicator = 'A'.
    COMMIT WORK.
  ENDIF.
  CALL FUNCTION 'POSTING_INTERFACE_END'.
Any pointers regarding the solution for this problem will be of great help.
Thanks,
Sushil Joshi

Answer 1

Hello Sujeet,
As I mentioned, we are using FM POSTING_INTERFACE_START, then POSTING_INTERFACE_CLEARING and POSTING_INTERFACE_CLOSE.
We have successfully tested this FMs for clearing documents over 50000 at a time, without splitting into sets of 999. Its only for this particular case that it is failing.
We have 1 payment document and rest others (over 200000) open items. So my question is - if we have to split for every 999 items, do we need to call the POSTING_INTERFACE_START, then call the FM POSTING_INTERFACE_CLEARING in a loop and at the end call POSTING_INTERFACE_CLOSE.
Will this post a single clearing document or a separate payment document for every set of 999 items ?
Please advise.
Thanks.