pruchase requisition line was pre-encumbered in a fiscal year that is different from the accounting date of the purchase Order hence the purchase order can't be created

Dear

i got the below error while trying to create a Purchase Order from a Purchase Requisition

The error is the following:

"pruchase requisition line was pre-encumbered in a fiscal year that is different from the accounting date of the purchase Order hence the purchase order can't be created"

the Purchase requisition is in 2013 and the purchase order is in 2014 , i don't see what the problem is

your feedback is greatly appreciated