Lawson Financials AR Report

Hello,
I am working on a report that I want to show the date an Acounts Receivable invoice was paid or "applied".
Is there any system time stamp anywhere in Lawson with this information?
The only dates I see are deposit_date and gl_date on the ARAPPLIED record. These are driven by user input I believe.
We wanted to create a metric using the date an invoice was acutally marked "Paid" in the system (order to cash KPI)
Has anyone created this? What tables are you using?
Thank you for any help in advance!
Anne