Expense report AP invoice - budgetary control derivation based on employee default expense account

Summary:

Currently, all invoices coming from expense reports are funds validated against the employee default expense account. Is there a way to derive something else/a fix value other than employee account?

Content (please ensure you mask any confidential information):

I have a bunch of payment request invoices coming from expense reports that are being blocked because of budgetary control is validated on employee expense accounts which are not exactly correct. SLA are setup but don't make a difference in budget validations.

Is there anything else I can do to change the account where funds are being validated, without modifying the employee accounts?