Solve Runtime errors 'CX_SY_CONVERSION_NO_NUMBER'

Question

When I test a subroutine that included in SAPScript,a runtime error occured.Below is the error message.
Unable to interpret " XXXX.XX " as a number.
Error Analysis:
An exception occurred that is explained in detail below.
The exception, which is assigned to class 'CX_SY_CONVERSION_NO_NUMBER', was not
  caught in
procedure "SUB_DETAILS" "(FORM)", nor was it propagated by a RAISING clause. Since the caller of the procedure could not have anticipated that the
exception would occur, the current program is terminated.The reason for the exception is:
The program attempted to interpret the value " XXXX.XX " as a number, but
since the value contravenes the rules for correct number formats,
this was not possible.
DATA: GV_AMOUNT TYPE KWBTR.
  READ TABLE IN_PAR WITH KEY NAME =  'FEBSCA-KWBTR'.
PACK IN_PAR-VALUE TO GV_AMOUNT.
>>>>> GV_AMOUNT = IN_PAR-VALUE.
How can i solve this ? Big help needed. Appreciated. Thanks,
Shehryar

Answer 1

Hi shehryar,
if you do a test output in SAPscript forms development in SE71, output fields are filled with X characters regardless if they are numeric.
If you call a subroutine in SAPScript, the values are passed and the CX_SY_CONVERSION_NO_NUMBER is raised.
In your subroutine you should be aware that all Sapscript symbols are character-like data and must be converted to numeric representation.
Try to integrate this subroutine (derived from Padmam's contribution yesterday):
*&      Form  conv
*       Try conversion to numeric value
FORM conv  USING    pv_clike TYPE c
           CHANGING pv_number
                    pv_error TYPE sy-subrc.
  TRY.
      CLEAR pv_error.
      pv_number = pv_clike. "Convert string to number.
    CATCH cx_sy_conversion_no_number.
      pv_error = 1.
    CATCH cx_sy_conversion_overflow.
      pv_error = 2.
  ENDTRY.
ENDFORM.                    " conv
Now you can test your form as well as use it.
Regards,
Clemens