Partially matching a Purchase Order with 0 quantity to an Invoice encounters a SQL Error

With the existing software, you can leave the 'Match Partial Quantity' unticked, and enter a partial quantity. This will work, provided that the goods have already been delivered. If they have not been delivered, then you can match the first partial quantity, but not a second until it has all been delivered. Please note that the outstanding value on enquiries is only based on the quantity ratio, so if a user manually enters a value, it will not be correctly reflected on enquiries.