Hi,
in this case the material seems to be created also in another plant in country Y which is assigned to another sales org.
Basically, the only interesting thing is the plant country. You should find entries in MLAN for all countries for which a plant record for the material is created and which is assigned to any sales org.
The sales org country and the company code country is not relevant for this.
What do you want to explore? If it is master data and you start with the sales org than you get into trouble if more than one plant with different countries is assigned to this sales org. If you want to analyze transactional data than you could pick up the plant and its country and read MLAN. But based on transactional data you should pick up the tax indicator from the i.e. sales order item directly as it might be changed there manually.
Best regards,
Oliver