Expected Behavior between Default Distribution Account on Invoice Line Level vs. account value in th

General Question:

We had a user that had entered an invoice in Payables and
matched it to a PO.  The user then
realized that the account value (547014) is incorrect when they opened the
Distributions form, as shown in this screenshot.

The user then overwrote the Default Distribution value
located on the invoice line level to a different value (130040) as shown in
this screenshot.

The user expected that the Default Distribution Account
entered on the line level should prevail over the value in the Distributions
form which is pulled from the requisition of the Purchase Order.  I assumed that the users expected behavior is