Hi experts,
After finished the step of a custom business configuration object:http://help.sap.com/saphelpiis_studio_1511/KTP/Products/bf889ebdf45d4dd19d4a0e0bd39a07fb/LibraryStructure/SAP_BBD_Studio…
Follow the steps of help, I created a custom business configuration object, then created the BC view, then created the BC set, then assigned the work center view.
Then check the scope and activity in "Edit Project Scope".
When I open in the Activity List, it raise:

What is the problem? Thanks.