How to unblock a row which has been partial received?

Question

Dear everyone,
I just have a trouble and need anyone help me.
Here is the case...
There is a PO with a row of 200pcs ordered.
Partial of them, say 50pcs, are received.
Then what happened on that row is that, as you know, the fields in that row except Qty and 'Del. Date' are all blocked, even for UDF.
-- I really need to be able to rewrite info on those UDFs in the row. Is there any way to enable me update data on those UDFs.
Thank you
Tony

Answer 1

Thanks, Gordon
The situation is that the client has a needs to record shipment status for each row (or each item). Continuing the example I gave in the first thread, the client ordered 200pcs on 08/15. later the vendor sends a notification that 50pcs will be delivered on 09/21. It means that the rest of them must be received on or after 10/18. (Because the vendor has a delivery schedule.)
On 09/21, the 50 pcs are received.
on 10/02, the vendor sent the second notification that 30pcs will be delivered. at this time, I need to record the follow info:
"--- 30pcs for 10/18, 70pcs for 11/19(following the vendor schedule) "
there are many rows(items) in a PO.
since the row is partial received, I just cannot update the above info in the row.
thanks
Tony