abap runtime error COMPUTE_BCD_OVERFLOW

Hi All,

I am getting the below dump while executeing zprogram in 4.0 version.

ABAP runtime errors    COMPUTE_BCD_OVERFLOW
       Occurred on     13.08.2013 at 14:41:16

>> Short dump has not been completely stored. It is too big.

Overflow for arithmetical operation (type P) in program "SAPLCSS7 "

Information on where termination occurred

The termination occurred in the ABAP/4 program "SAPLCSS7 " in
"STUFE_02".
The main program was "Z_DOC_R_G1_002 ".

The termination occurred in line 242
of the source code of program "LCSS7FS1 " (when calling the editor 2420).

Source code extract

FORM STPO_LESEN USING LKL_STLAL.
   CLEAR: RET_CODE.
   CALL FUNCTION 'GET_STPO'
      EXPORTING  ALTER  = LKL_STLAL
                 DATUV  = PM_DATUV
                 SET    = 'X'
                 ALL    = 'X'
      TABLES     WA     = STPOB
                 ADD_WA = STERNTAB
      EXCEPTIONS NO_RECORD_FOUND      =   1
                 KEY_INCOMPLETE       =   2
                 KEY_INVALID          =   3
                 CALL_INVALID         =   4.
   RET_CODE = SY-SUBRC.
ENDFORM.

  FORM STUFE_01.
     AST_STUFE = 0.
  ENDFORM.

  FORM STUFE_02.
==> APS_STUFE = AST_STUFE + 1 .
  ENDFORM.

  FORM STUFE_03.
     CHECK NOT LTB-XTLNR IS INITIAL.

     AST_STUFE = LTB-STUFE.
  ENDFORM.

How to solve this issue. Please advice.

Thanks,

Venkata