Add reference to properties used for joins
Add reference to properties used for joins

piotras/midgard-core,midgardproject/midgard-core,piotras/midgard-core,piotras/midgard-core,midgardproject/midgard-core,piotras/midgard-core,midgardproject/midgard-core,midgardproject/midgard-core