Warehouse REceipt Error

WE are receiving an error when posting a Warehouse Receipt, stating that it cannot be posted because the Purchase Order has not been Approved and Released. The Order has been approved and released.
Can see no reason why?

Has anyone come across this

NAV 2017
Completely Standard Warehousing and Workflows

Any ideas would be greatly appreciated

Is there a chance the Purchase Order was Reopened?

I checked that
I deleted the WHR, reopened the order, released the order, recreated the WHR, and still the same error

Have you confirmed that the PO has not been setup with Prepayments?