What value should show up under header Reference on the Manage Receipts Search?

Summary:

Customer expects to see the value Invoice Reference Number under header Reference when they search receipts by Manage Receipts. Now it does not show any value.

What is the value that would show up there if it is populated? I could not find this information from MOS or user guides.

Content (required):

Receivables Manage receipts

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):