E10 Foreign Multi Key View - Error

Trying to link OrderHed to Customer Contact in a customization. I select Foreign Multi Key View as View Type. Like Column is CustCnt.ConNum. I use KeyView OrderHed Key Columns CustNum, ShipToNum, and PrcConNum When I click OK I get the error.

 Invalid FKView registration, count of Binding strings must match ValidationType from ContextMenu.xml

I checked ContextMenu.xml and the Validation Type is shown as GetByID and using BL-Tester, GetById for CustCnt  requires 3 values,?????

Can anyone see what I am doing wrong, besides trying to use the built in tools instead of writing all the code to use the adapter......