Table DocuRef is have notes on D365 F&O. When they are synching back to ADLSGen2 vis SynapseLink, they are turning out to be NULL. Few records I see comments whereas few are missing.Please advice what is missing here.

Table DocuRef is have notes on D365 F&O. When they are synching back to ADLSGen2 vis SynapseLink, they are turning out to be NULL. Few records I see comments whereas few are missing.Please advice what is missing here.