Payments by Performance vs GL Summary

Hello!

We've run into a challenge reconciling a gala involving two organizations. I'm hoping some Tessitura genius might shed light on the intricacies of these reports.. I've read all documentation, reviewed every order entry against actual orders, verified the postings in Quickbooks against the GL Summaries and cannot find the difference.

I created specific GL Lines to post Gala Tickets and Gala Donations (we do not have the development module and we're in a consortium). Additionally, I created a Payment Method for all revenue paid to / received by the other organization to allow tracking for settlement later.

Finance took their total revenue from the daily GL Postings into Quickbooks, compared it to the Payments by Performance, deducted the amount listed as the other organizations revenue and are coming up with a $79K difference between the two reports. It's not an issue with the funds going to the other organization given that's over $100K.

I cannot find the difference. I have combed through the Performance Transaction Detail, GL Summaries and Payments by Performance.  Each gives a different bottom line number as does the Box Office Statement.

Finance states they have not made data entry errors though I do see a $22K difference when I compare their Quickbooks detail to the GL Summaries day to day. I've confirmed all orders were entered correctly by the box office.

What could it be and how in the world do you find it when nothing matches? We're in our third season and never encountered a difference of this size on an event.

My theories are/were:

One of the price types was not posting to the correct GL - not the case

Data entry errors by one of the departments - not the case.

Orders purchased in the wrong event. - not the case.

Has anyone else run into this?  Am I missing something with respect to how the reports are posting payments?

For example, doe the Payments by Performance report deduct refunds, exchanges, etc or is it giving us the gross amounts posted?  If yes, it would follow that the GL Summary should be the bottom line to rely on net proceeds correct?

Any advise, experience or a lead to other documentation that might be helpful would be most appreciated!