Negative expense amount

I was able to enter negative amount in version, however, it’s not allowable in .39 version, able to modify this through BPM? If yes, how?
Thank you!

Were previous expenses entered that netted a positive amount? For instance, the employee owes $12 for something, but is being reimbursed for $45 also. The net amount would still be positive $33.

Nope, the expense is entered as negative -89.25 this month against the expense positive 89.25 entered last month.