Getting error "Statement not accessible"! Please help!

We upgraded from 4.6C to ECC6.0 and some warnings in 4.6C are "syntax errors" in ECC6.0! I have the following code:

SELECTION-SCREEN BEGIN OF BLOCK B4 WITH FRAME TITLE TEXT-T04.

UNIX_SINGLE 'MYPAR1' MYPAR3 P_BDWAVE TEXT-SS3.

SELECTION-SCREEN END OF BLOCK B4.

UNIX_SINGLE is a macro. I found some information on this error here but could not relate my problem to any of those forums! Could someone please help! Any answers will be rewarded.

Thanks.

--Mithun