Transfer Routine Error

Hello Everyone,

I am getting the following error in the Transfer routine of InfoObject ZOBJ.

W:A USING reference parameter should not be used. Instead, define the parameter as a USING-VALUE(...) or CHANGING parameter.

The code is:

IF TRAN_STRUCTURE-ZZF = 'AAA'.

TRAN_STRUCTURE-ALTKT = TRAN_STRUCTURE-BELNR.

****The error points to the above line. *********

ENDIF.

RESULT = TRAN_STRUCTURE-ALTKT.

Note: 1. ZZOBJ is mapped to ALTKT.

2. ALTKT and BELNR have asme data type and length.

3. ZZF is an appended field to the DS.

Thanks.