Deferred expense waterfall detail report issues with bills that have been created from a PO

Hi

I experience issues in the deferred expense waterfall detail report, whenever I raise a bill a from a PO and then place an amortization template on the bill. See below unplanned amounts

The PO seems to show up on the report and does not offset against the bill. When the bill is fully expensed it equals the amount of the PO.

Below is an example, when the bill is partway through expense recognition

The expense that is recognized is correct, and the deferred balance is correct too

The problem, in each financial report it comes up as an exception and I would like it to present correctly like bills with amortizations but were not generated from purchase orders.