Miro: When enter op number,fill a special value into SGTXT automatically

Question

Hi guys
   When user inputs the PO number, PO description will be filled into the field TEXT on the line item automatically. So user can view it
  After my testing again and again, I did not find there is an optional user exit or badi(listed below) to meet this requirement.
It would be great enough if you can help me resolving this issue ASAP.
BADI:      invoice_update
User Exit:
LMR1M001            User exits in Logistics Invoice Verification
LMR1M002            Account grouping for GR/IR account maintenance
LMR1M003            Number assignment in Logistics Invoice Verification
LMR1M004            Logistics Invoice Verification: item text for follow-on docs
LMR1M005            Logistics Inv. Verification: Release Parked Doc. for Posting
LMR1M006            Logistics Invoice Verification: Process XML Invoice
MRMH0001            Logistics Invoice Verification: ERS procedure
MRMH0002            Logistics Invoice Verification: EDI inbound
MRMH0003            Logistics Invoice Verification: Revaluation/RAP
MRMN0001            Message output and creation: Logistics Invoice Verification
Thanks a lot.
-Daniel

Answer 1

i have fix the bug.
IF_EX_AC_DOCUMENT~CHANGE_INITIAL
IF NOT sy-tcode = 'MIRO'.
    EXIT.
  ENDIF.
Variant
  FIELD-SYMBOLS: <fs_table> TYPE ANY TABLE,
                 <fs_line>  TYPE ANY,
                 <fs_ktosl> TYPE accit-ktosl,
                 <fs_buzid> TYPE accit-buzid,
                 <fs_sgtxt> TYPE accit-sgtxt.
  DATA: lv_sgtxt TYPE accit-sgtxt.
Get the SGTXT value on the Basic data tab
  ASSIGN ('(SAPLMRMP)XACCIT[]') TO <fs_table>.
Checking the field symbol
  IF <fs_table> IS NOT ASSIGNED.
    EXIT.
  ENDIF.
  LOOP AT <fs_table> ASSIGNING <fs_line>.
    IF SY-TABIX = 1.
      ASSIGN COMPONENT 'SGTXT' OF STRUCTURE <fs_line> TO   <fs_sgtxt>.
      lv_sgtxt = <fs_sgtxt>.
      EXIT.
    ENDIF.
  ENDLOOP.
  IF lv_sgtxt IS INITIAL.
    EXIT.
  ENDIF.
Fill the long text(SGTXT) into the tax item line
  LOOP AT <fs_table> ASSIGNING <fs_line>.
    ASSIGN COMPONENT 'BUZID' OF STRUCTURE <fs_line> TO   <fs_buzid>.
    IF <fs_buzid> = 'T'.
      ASSIGN COMPONENT 'SGTXT' OF STRUCTURE <fs_line> TO  <fs_sgtxt>.
      IF <fs_sgtxt> = space.
        <fs_sgtxt> = lv_sgtxt.
      ENDIF.
    ENDIF.
  ENDLOOP.
Thanks a lot.