When the reusable part doesn't contains drawigs the Teamcenter doens't clone Excel and KRX datasets. So if I don't want to clone that will I change relationship type from iman_specification to other type?
This looks like a bug to me. I also confirmed that the KRX and MS ExcelX datasets are not copied over if the Item Revision does not contain a UGPART dataset.
Can you open an IR with GTAC and have them review the issue?