Error in FP50ME00 when updatating psbuffer

Question

Hi everyone.
I get a CX_SY_DYN_CALL_ILLEGAL_TYPE exception when I call the update buffer form int he SAPFP50M program.
Here is the sample code:
PERFORM update_0105 USING  '0010' wa_stat-email.  "Updates the 105 infotype with the HR_INFOTYPE_OPERATION FM
PERFORM update_0105 USING  '0020' wa_stat-tel.
PERFORM update_0105 USING  'CELL' wa_stat-mobil.
PERFORM update_0105 USING  '9010' wa_stat-lst.
    perform update_buffer(sapfp50m).
    commit work.
    call function 'HR_PSBUFFER_INITIALIZE'.
The error comes from here:
IF T777D-NAMST SPACE. "QNOK008925
   MOVE CPREL TO PSHDR.
   MOVE CPREL-SUBTY TO PSHDR-SUBTY.
   MOVE PSHDR TO <PSHDR>.   "HERE IS THE ERROR BECAUSE <PSHDR> NOT ASSIGNED
ENDIF.
I need to update the psbuffer because the whole code is in a RFC FM some HR data is sent to this interface. And I need the update buffer, because I have the infotypes in internal tables like P0105. So I need to update the internal tables, not just the database.
Does anyone has any idea how can I solve this problem?
Thanks
N.

Answer 1

This is possibly an SAP error, because the T777D-NAMST hasn't been initialized by the update_bufffer form.
The solution was to clear this variable form the memory:
ASSIGN '(SAPFP50M)T777D-NAMST' TO <fs>.
IF <fs> IS ASSIGNED.
  CLEAR <fs>.
ENDIF.