The following applies when a Bill or Purchase Order (PO) has already been synced to Xero, but you need to correct the allocation.
To unlink a bill (that has been synced to Xero) from a PO or budget item, navigate to Finance > Bills > select the relevant Bill.
Once the edit bill screen pops up, click on the linked budget / PO button and this will drop down a menu allowing you to unlink the bill items from the PO or budget items.
To exit, you must re-link the Bill or PO to another budget item.
