Part Family Members are by default not to be exported from TC. Exporting an assembly containing such part might raise some questions. Two possibilities to export part family member is by either turning off both options in its dedicated chapter within Customer Defaults or by setting the environment variable “UGII_UGMGR_ALLOW_PFM_IMPORT_EXPORT=1”.
The difference to the previous method is that in the exported assembly, it will be exported as the original one. In assembly navigator part family member will be shown as such.
The part family member will also remain unmodifiable.
Setting this environment variable will take precedence and will overrule related settings in Customer Defaults.
More about export-import of part family member can be found here.