Arrived date different in two places for same transaction

We are on 10.2.200.6. We are trying to get a handle on supplier deliveries and have come across two different Arrive Date values for the same receipt.

The Receipts tab in the Purchase Order Tracker shows the ArrivedDate as 8/20:

The Receipt Tracker and it shows the ArrivedDate as 8/21:

Interestingly, the PO Tracker | Receipts tab is correct, but according to Field Help, it is not tied to any database field. The Receipt Tracker value seems to have defaulted from the Entry Date, rather than the Arrival Date.

Does anyone know how to force the line level values to be correct?

I think the packing slip must have it’s own and each line can have it’s own. It looks like the PO tracker is pulling it from the packing list header, and not the line.

After some testing, it looks like the arrived date on the summary line is automatically put in when you add the line, and not changeable (in the UI anyways) after entry. The PO tracker uses the header on the packing slip for the arrived date. Which is changeable (until it’s invoiced I think). The receipt date can be set on the line level and also displays in the PO tracker.

Most of this is looks like it’s going to be defining what those dates mean to your company. (We have issues with definition of dates around here like you wouldn’t believe!)