Customer exit is not functioning after ECC upgrade/support package

Question

It seems our customer exit is not functioning after ECC upgrade/support package. I tried to activate the project again, no use. please help. Thanks! (see below for the enhancement info)
COZF0002 Change purchase req. for externally procured component
EXIT_SAPLCOZF_002
INCLUDE ZXCOZU02
*&  Include           ZXCOZU02
CONSTANTS: lcc_eban(25)   TYPE c VALUE '(SAPLCOBC)EBAN'.
FIELD-SYMBOLS: <fs_eban>   TYPE eban.
DATA: l_fkstl TYPE prps-fkstl.
Move values from the LUW to the Internal Table
ASSIGN (lcc_eban) TO <fs_eban>.
If the field symbol is "NOT' empty then proceed
IF ( <fs_eban> IS ASSIGNED ).
if WBS work order, get cost center from PRPS
  IF ( caufvd_imp-auart = 'ZM05' ).
    SELECT SINGLE fkstl INTO l_fkstl FROM prps
      WHERE pspnr = caufvd_imp-pspel.
    IF ( sy-subrc = 0 ).
      WRITE l_fkstl TO <fs_eban>-zzfistl.
    ENDIF.
if not WBS WO, move cost center minus leading zeros to funds center
  ELSE.
    WRITE caufvd_imp-kostl TO <fs_eban>-zzfistl.
  ENDIF.
ENDIF.

Answer 1

Did you mean set a break point in the follow code?(Include ZXCOZU02), I tried set a break point in this code, but It didn't stop .
*& Include ZXCOZU02
CONSTANTS: lcc_eban(25) TYPE c VALUE '(SAPLCOBC)EBAN'.
FIELD-SYMBOLS: <fs_eban> TYPE eban.
DATA: l_fkstl TYPE prps-fkstl.
Move values from the LUW to the Internal Table
ASSIGN (lcc_eban) TO <fs_eban>.
If the field symbol is "NOT' empty then proceed
IF ( <fs_eban> IS ASSIGNED ).
if WBS work order, get cost center from PRPS
IF ( caufvd_imp-auart = 'ZM05' ).
SELECT SINGLE fkstl INTO l_fkstl FROM prps
WHERE pspnr = caufvd_imp-pspel.
IF ( sy-subrc = 0 ).
WRITE l_fkstl TO <fs_eban>-zzfistl.
ENDIF.
if not WBS WO, move cost center minus leading zeros to funds center
ELSE.
WRITE caufvd_imp-kostl TO <fs_eban>-zzfistl.
ENDIF.
ENDIF.