How can we hide PNC Check Payment Method from the Expenses entry drop down list?

We recently noticed that a new payment method called "PNC Check Payment Method" has appeared in the drop down list on the Expense entry screen. We would normally go to the Manage Payment Methods screen and remove the Expenses Document option, under the Usage Rules/Payables/Payment Process Transaction Types section. However, when I pull up this new payment method, I am not allowed to update the setup, even if I have the Application Implementation Role.

Does anyone know how we can remove this payment method from the expenses drop down list? We have employees selecting it, when it is not a valid payment method for our company.