"Receipt amount greater than remaining reservation balance" error

Summary:

"Receipt amount greater than remaining reservation balance" error

Content (please ensure you mask any confidential information):

I submitted a Spend Authorization for an estimated expense for Per Diem of $300 amount.
Then travel took place, the expense is actually $350, so we need to submit an Expense Report for $350 for that same Authorization number. However we received the message below when trying to save it:

"Receipt amount greater than remaining reservation balance"

• Is there a way that the expense item cost can exceed the authorization amount? Can we override this?
• If not, what are the workaround that others are using to be able to overcome this error? Thank you!