Cash Advance Reconciliation Inactive Employee

We have a member of staff who was person type Employee, received a Cash Advance and since then has spent some of the Cash Advance but has had Employee assignment terminated and now has a "Non Worker - Unpaid" assignment.

This member of staffs former line manager is a delegate so they can submit expenses but when they try to submit to reconcile the Cash Advance, they get an error stating inactive employee expense reports cannot contain cash items. We need to clear this Cash Advance, what can we do? What determines this inactive error as the users current non worker assignment is active.