In the Material field, I have properly written the RelatedIfcEntityNamesList, but it is not imported.

Hi @YoshiyukiMiyauchi, we’re trying to find out why you see this error. By the way, we’re soon deploying the new data model to production (you can read more here: bSDD tech updates - #14 by artur_tomczak). It doesn’t contain the Material object, but instead, you would use a Class of type “Material”. There you shouldn’t have that issue. You can test the new model on the Test environment (links on GitHub).

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