Confirm the PO is not "Fully Received" if you are trying to cancel it. A PO cannot be canceled if the ordered quantity matches the received quantity.
: Unprocessed receiving transactions in the "Transaction Status Summary" form can block control actions. Disabled Charge Accounts
If you are trying to cancel a PO and receiving this error, check for pending transactions: : Receiving > Transaction Status Summary .
: The most frequent cause is trying to perform an action (e.g., "Cancel PO") that is not allowed for the document's current state (e.g., it is already "Fully Received" or has "In Process" approval).