Incorrect billing schedule

Hi Team,

I came across an issue where Incorrect billing is creating for the last quater against one of the contract. The billing amount shows in total less than the contract amount, although it covered the whole contract period. (The amount of the last quarter Q4 is too low) Can you please advice what is the issue here as soon as we hiit on the schedule the last year quater amount changes to 3390.93.

Actually I am confused here because contract total amount is 16864.57 and initially billing schedule created for amount 16167.52 (sum of all Quater period). But as soon as we hit on Schedule button the last quater amount again reduces to 3390.93 I have attached the screen shots also please validate the same.