Invoice line DFF is not being pulled from the Payment XML

Summary:

How to pull the invoice line DFF from the payment XML?

Content (please ensure you mask any confidential information):

We have a requirement where we need to extract to our SRA a data from the invoice line DFF. But when we created a DFF and entered a data, it's not showing up in the payment XML (Outbound payment instruction). There are a lot of DFF attributes there but not a single one captured my DFF at the invoice line level

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

25D (11.13.25.10.0)

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