Typecasting XBLNR (CHAR 16) and VBELN(CHAR 10):

I read the issue  in SAP SDN:

I am facing type and length error while coding the below select statements.
IF TA_MKPF[] IS NOT INTIAL.
Select TKNUM VBELN from VTTP INTO TA_VTTP FOR ALL ENTRIES IN TA_MKPF
WHERE VBELN = TA_MKPF-XBLNR
ENDIF.
Now XBLNR is CHAR 16 field and VBELN is CHAR 10 field.That the reason why there is a TYPE and LENGHT mismatch error.
Please suggest how to do the type match so that the erro can be removed and the assignment is also done successfully.
 

Solution :

 

DATA : it_mkpf TYPE STANDARD TABLE OF mkpf.

TYPES: BEGIN OF t_mkpfnew.
        INCLUDE STRUCTURE mkpf.
TYPES: vbeln TYPE vbeln,
       END OF t_mkpfnew .

DATA : it_mkpfnew TYPE STANDARD TABLE OF    t_mkpfnew.

DATA : wa_mkpf    TYPE mkpf,
       wa_mkpfnew TYPE t_mkpfnew.


*     it_mkpf[]  = importing  table of badi

LOOP AT it_mkpf INTO wa_mkpf.
  MOVE-CORRESPONDING wa_mkpf TO wa_mkpfnew.

  CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
      input  = wa_mkpf-xblnr
    IMPORTING
      output = wa_mkpfnew-vbeln.

  APPEND wa_mkpfnew TO it_mkpfnew.

ENDLOOP.