Hey @Laurent_Auneau,
This is indeed a limitation of Cross-doc. For references to work you have to import the base table of that referenced table, which is not ideal.
You have two options:
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Instead of references, cross-doc row IDs, and then on the receiving side restore those references through a formula. I’m talking about all of this in my old video Cross-doc Best Practices
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Use my pack, Sync Tables Pro, which is a cross-doc replacement built with all these issues in mind. STP will actually force you to sync views not base tables, and actually preserve such references.