Unable to post to a GL account

I am trying to post an invoice using transaction FB50. Agsinst a line item, I entered a GL account and all other details including company code. When I tried entering a cost centre against this line item, I got an error msg - An Entry Cost Centre is not Permitted for account 4567890.

The GL account is a P&L account which allow manual posting. I have been able to run this very transaction and posted against this GL & Cost Centre sucessfully.

Can someone please help me by telling me wht Iam getting this error msg.

Thanks in advance.