Urgent: How to Update Receipt Close Tolerance Percent on PO schedule for Bulk POs?

Summary:

We have a requirement where we need to update/Change the "Receipt Close Tolerance Percent" value from 10% to 0% on 12000 POs.

Is there a way to do that? May be through Webservice or any other tool?

The reason behind this requirement is that, suppose for a PO line, the Ordered Quantity is 100 and the supplier has sent 2 shipments, one with 90 Qty and another with 10 Qty. Now when we receive the first shipment after that, it changes the line status to "Closed for Receiving". Due to this, when the second shipment comes, it doesn't allow it to be received in the system.