show each payment received as a separate line item on the invoice and subtract each from the remaining balance of the invoice separately.
For example, if my invoice total is $1,000.
Client paid one payment of $300, it would show that payment received on its own line, and subtract it from the $1000 and show remaining balance $700.
A second payment for $400 would then be added to the invoice also having a separate line on the invoice and be subtracted from the REMAINING BALANCE of $700, and would then show a Remaining Balance of $300.
Currently, the payments are subtracted together, instead of showing each payment received separately, and separate deductions from the remaining balance.