Hi,
This error is caused due to Period control and C/F Budget of PR/PO.
Do C/F of PR/PO using FMJ0 and the amount should be 0 during C/F.
If this does not work then,please try the following:
Please enter budget amount in the last year and select period as ALL. Again enter the budget amount in the beginning of the current year and select period as ALL. Then C/F the PR/PO before releasing the budget in the current year using T. Code FMJ2 with Check in the availability control. After this Release the budget of the current year. Check that the budget available balance is the same as before uploading the budget amount. After this MIRO should work.
Thank You.
Regards,