How to remove expired tax rates from dropdown in Create Invoice

Summary:

We have expired tax classifications, but they still show up in the dropdown when creating an invoice

Content (required):

Right now this applies to the Test environment and the NO Business unit, but will apply to others and Production. We have several tax rate codes that have expired end dates, but they still appear in the Tax Classification drop down in the invoice entry process. We are able to delete them in the Manage Tax Rates and Tax Recovery Rates module from the Transaction tax rate tables. However, they still appear in the dropdown noted above. Is there a way that we can also delete these from the drop down in order to make the users process easier? Thanks.