make/buy list value is not appearing for the source attribute while creating WTPart

I need to create an OEM part to attach with Part Request. The condition of OEM part is that the source attribute value should be "buy".

In the Type & Attribute Manager, the source attribute values are already defined OOTB as "buy|make|singlesource|NOT_SET value, But while creating the part, the source attribute shows only the "Not Set" in the drop down list.

Do we need to enable somewhere in the preferences or properties file to list the make/buy/singlesource values?

Please help me.

Windchill Version: 10.2 M020

Thanks in Advance.

Suresh Babu AD