This happened to me and I came here for the solution, but I think I figured it out on my own. Here's what happened - I created a bill off the PO and had changed the amount to reflect the 50% deposit per the agreement. Then I paid the bill. That made QBDT think the PO was closed. The only way I could get the PO back open was to delete the bill and bill payment, then re-open the PO. So, there must be a different way of receiving the partial PO - THIS WORKED - Try creating multiple line items with the same cost code - one for the 50% deposit that's half and one for the completion payment to indicate the other half, or however your pay schedule may be. This way you can receive one line without receiving the other when you create bill...I don't think QBDT identifies a partially received line item. I did this and was able to create two bills, Receiving one line item in the first bill and the other line item in the second bill. To unselect receiving a line item, just change the quantity for that line item to 0.