Creating Trade Operations using Schedules

Summary:

We are attempting to create trade operations using the Allocation Quantity Type 'Purchase order schedule quantity'. To better illustrate my requirement, let's consider a PO with one line item of 10 units, divided into two schedules: 3 units (line-1, schedule-1) and 7 units (line-1, schedule-2). I have already created a trade operation for schedule-1, allocated all charges, and received the item.

Now, as I prepare to receive schedule-2, I need to create a new trade operation. However, the main challenge is that I can't recall which schedule was initially assigned a trade operation (we create purchase order with many lines which will exacerbate this scenario).