Help to generate timekeeper collections report to show payments AND credit balances applied to timekeeper slips for time period.

I’m trying to generate a report to show application of payments AND existing credit balances to a timekeeper’s slips billed when there is already a credit balance on an account based on a payment outside of the time period of the report. 

For example, if I issue an invoice on February 1st for the time period for Jan 1st through January 30th and the client already has a $3000 credit balance carried over on their account into that time period i need to generate a report that shows application of payments received for that time period AND total application of any credit balance on the client's account towards the hourly rate timekeeper slips appearing on that time period's invoices  in our example that would be for all of these items appearing on the January 1 through January 30th time period for the February 1st invoice date.  

When I try to use the timekeeper "Contributions and collections" report it just shows PAYMENTS received during that period being applied to timekeeper slips billed that month but not application of credit balances that happen on the invoice. 

Any help is appreciated! 

Thank you

Joe