Negative flat fee

Hi team, I would like to request an enhancement to the flat fee feature so that the system allows the entry of negative amounts. Currently, independent contractors and businesses need a way to apply discounts or credits directly within the app without having to manually adjust reports after exporting. Because negative credit entries aren't supported, the final total doesn't accurately reflect in the client's internal history, which complicates their record-keeping. Enabling negative values in this section would greatly resolve this issue.