Substitution was deactivated for account determination SAP PP - FICO Interg

Dear All,

We are facing a problem in T-Code CO11N.

when we are saving our confirmation , we are getting an error , that is ,

Message Type :- E

Application Area :- K5

Message Number :- 110

" Substitution was deactivated for account determination".

We have checked the status in the T-Code KALC , it shows a message box stating

"New General Ledger Accounting is Active"

Plz provide the step by step solution for this error.

Thanks & Regards,

Vivek Sharma