"The endpoint does not exist or the action is not allowed" on Payment journal voucher send

Just a quick post for non-developer who hit this error and looking for solution.

If you're setting up AIF Outbound port for Payment journal, you'll need to add the "LedgerVendorPaymentService.find" operation to the port.

Without this port, when you click on the "Send..." button on the Payment journal voucher, you'll first get the error "No endPoints are configured for the action".

But the "Send document..." dialog will still shows up, and if you continue to select the Port name and click "OK", you'll get the error "The endpoint does not exist or the action is not allowed".

To fix this issue:

1. Go to: System administration > Setup > Services and Application Integration Framework > Outbound ports
2. Select the respective port name and click “Deactivate”
3. Click on “Service operations” button under the “Service contract customizations” FastTab
4. Double click on the “LedgerVendorPaymentService.find” service operation under the “Remaining service operations” list to add it into the “Selected service operations”
6. Close the form
7. Click “Activate” button to activate the Outbound port again