SLA: Supporting Refernce for Custom Source with Event class type Payment

Hi All,

We are trying to add the event class type as 'Payment'  to Support reference page for our Custom sources.

We had successfully assigned the event class type as invoice for Custom sources, but when trying to assign the Event class type as payment by selecting the Custom sources we unable to attach for this and when we select the button GO--showing there are 'No data found'.

for other event class type like seeded Payments with seeded Sources it is successfully showing, even i have tried other than my business instance it is having the same issue.

Does Support Reference will support for the event class type as Payment when we select the Custom sources ?