Unable to SAVE Calculation View

Hi All,

I built 2 attribute views and tried to call them in a calculation view using projection.

I couldn't. I wasn't able to save the calculation view. I get the below error:

"Save Failed while trying to invoke the method com.sap.ndb.studio.model.data.type.ObjectType.equals(java.lang.Object) of a null object returned from com.sap.ndb.studio.model.data.entity.Entity.getObjectType()"

in popup.

Please help in this regard.

Thanks,

Venkat