HR_INFOTYPE_OPERATION does not update eeamt of P0169

Hello Experts,

I am unable to update the EEAMT, that is, (pre-tax contribution) while using the HR_INFOTYPE_OPERATION .

The value is passed to the FM, however it fails in the standard method - HR_INFOTYPE_OPERATION .

While debugging the transaction, the value exists at:

ASSIGN record TO <record> CASTING TYPE (tabname).

But in the following loop the amnt exists in C(255), and the value is not getting condensed.
* loop at nametab.                                          "XDPK000210
   LOOP AT NAMETAB WHERE TABNAME = TABNAME.  

Please help.....

Code snippet:

     LOOP AT lt_pa0169 INTO ls_pa0169.
               IF sy-subrc = 0.
                 ls_p0169-pernr = lv_pernr.
                 ls_p0169-infty = '0169'.
                 ls_p0169-pltyp = lv_subty = ls_pa0169-pltyp.
                 ls_p0169-bplan = ls_pa0169-bplan.
                 ls_p0169-begda = lv_begda = ls_pa0169-begda.
                ls_p0169-eeamt = ls_pa0169-eeamt.  "this is what has to be refelected...
                 ls_p0169-curre = 'USD'.
                 ls_p0169-endda = lv_currdate. "'20141231'.

               ENDIF.
               lv_endda = '99991231'.

               CALL FUNCTION 'HR_EMPLOYEE_ENQUEUE'
                 EXPORTING
                   number = lv_pernr.

               CALL FUNCTION 'HR_INFOTYPE_OPERATION'  "Fails here
                 EXPORTING
                   infty         = '0169'
                   number        = lv_pernr
                   subtype       = lv_subty
                   validityend   = lv_endda
                   validitybegin = lv_begda
                   record        = ls_p0169
                   operation     = 'MOD'
                   tclas         = 'A'
                 IMPORTING
                   return        = w_return.

                  COMMIT WORK.

               CALL FUNCTION 'HR_EMPLOYEE_DEQUEUE'
                 EXPORTING
                   number = lv_pernr.

             ENDLOOP.

Many thanks,

Neethu