Account xxxxx requires an assignment to a CO object

Hi Experts,

When iam doing a Customer Invoice in F-22 or FB70, getting an error message "Account xxxxx requires an assignment to a CO object"

We are in Realization Phase, Testing is going on. Ours is April - March fiscal year.

When i gave the posting Date before 31.03.2012 then invoice is successfully posted (Given Profit Center as CO Object).

when i gave the posting date as 01.04.2012 then it is displaying the error. Tried giving Cost Center, Profit Center, Internal Order, but still it is giving same error msg.

awaiting your valuable solution.

Regards

Kumar