handle invalid char at end of text

We have written below abap code to handle invalidchar ..

Still I am facing below error while activating DSO. present abap cod is  not handling if invalidchar are at end of text.

Sample text data from ECC:

Value " CASQUES IRIS 2, DE COULEUR VERTE RF 05010110 " (HEX 20004300410053005100550045005300200049005200490053) of characteristic 0POSTXT contains an error at position 46

DATA : INT_VAR TYPE /BI0/OIPOSTXT.
DATA : str_var1(60) TYPE c.
DATA : var2 TYPE i.
DATA : var3 TYPE i.
DATA : var4 TYPE i.
DATA : str_var6(60) TYPE c.
DATA : length TYPE i.

MOVE SOURCE_FIELDS-SGTXT TO INT_VAR.

TRANSLATE int_var TO UPPER CASE .

length = STRLEN( int_var ).
DO length TIMES.
   IF int_var CN
   ',<>?/\:;"''ABCDEFGHI JKLMNOPQRSTUVWXYZ!%^&*()__+=1234567890' .
     IF sy-fdpos IS INITIAL.
       CLEAR str_var1.
     ELSE.
       str_var1 = int_var+0(sy-fdpos).
     ENDIF.
     var2 = STRLEN( int_var ).
     var3 = sy-fdpos + 1.
     var4 = var2 - var3.
     IF var4 EQ 0.
       str_var6 = int_var+sy-fdpos.
     ELSE.
       str_var6 = int_var+var3(var4).
     ENDIF.
     CONCATENATE str_var1 str_var6 INTO RESULT.
   ELSE.
     RESULT = int_var.
   ENDIF.
   int_var = RESULT.
ENDDO.
RESULT = int_var.

please let me know any additional settings required in BW system or modifications of abap code?