Accounts and Payment Process Profiles for Payroll

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I wasn't sure if this should be posted somewhere in HCM or not, so I'll start here. I've been asked to set up positive pay, and the payment process profiles. When creating the Payment Process Profile, I am not able to select our Payroll bank account as the Disbursement Bank Account. Also, on the Manage Bank Account page where I can specify the Default Payment Document, the field disappears from the screen when I click edit. I'm attaching a screen shot showing the field before and after clicking edit. Am I missing something in the process, or are we totally