Missing attachment tag in Collaboration Messaging invoice outbound XML file

Summary:

When we are extracting the XML, the attachment tag and some other delivery tags are not present in the XML file. We have attachment present for the invoice we are using to run the extract. We are using UBL-2.1-PEPPOL-Invoice-Out-v2 as our message definition and attachment tag is present in the respective XSL.

Need help in understanding if we are missing some setups or this is not supported by Oracle.

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