You might or might not have noticed in AX2012 R2, the use of projects as an offset account type has been blocked.
If you try and select it you get a message like this.
This was intentionally done by Microsoft to avoid further critical issues. Specially certain scenarios causing ledger in balance.
Now, you have to remember there are alternatives to this.
You can still use it as the main account and then use something else as the offset account.
Otherwise, do it as two lines journal. [No screenshot]