One travel authorization is available to be attached for multiple Expense Reports. How to control?

Summary:

Currently, our client has a requirement where user should submit Travel Authorization and attach it to the Expense Report for all the reports. There is no budgetary control so we are not using the Funds Application option.

The problem is even after attaching a Travel Authorization to an Expense report and even after getting paid for the Expense report, the Travel Authorization is still available for the next expense report. The user need to manually close the Spend Authorization for it to not appear while creating the Expense Report.

Is this the current functionality or is there any way to control it?