Windchill - SolidWorks: Wrong Attribute assignment

I am using Windchill PDMLink Release 12.0 and Datecode with CPS 12.0.2.26 If a SolidWorks custom propertiy is existing with the same name like the Windchill attribute, than the value of the "Windchill name Attribute" will updated in the SolidWorks file - the mapped SolidWorks custom property will be ignored. If the "Windchill name Attribute" is NOT existing in the SolidWorks file, than the mapped SolidWorks custom property will be updated correctly. We want the assigned SolidWorks custom property to always be updated — not the "Windchill name Attribute" attribute. The questions need to be answered: How to force Windchill / Windchill Workgroup Manager to assign the correct mapped property ?