We are having troubles with the XML importer to Commerce V13.15. In general everything works as expected but setting the excluded markets for a variant does not seem to have any effect.
We are using the syntax we could find in multiple blog posts and community posts:
<MetaField>
<Name>_ExcludedCatalogEntryMarkets</Name>
<Type>EnumMultiValue</Type>
<Data language="en">
<Item value="115" />
</Data>
</MetaField>
When the catalog is imported, no markets are excluded. If we set the excluded markets directly in the Commerce UI and do an Export using the commerce manager, the above XML is outputtet.