Exception Creating UDF In A View Model Trying To Set "relational:null-on-null" Property

Creating a UDF in a view model I get this:

!MESSAGE Error setting extension properties on Abc
!STACK 0
java.lang.Exception: The property definition "relational:null-on-null" could not be found.
at org.teiid.designer.core.extension.EmfModelObjectExtensionAssistant.setPropertyValue(EmfModelObjectExtensionAssistant.java:485)
at org.teiid.designer.metamodels.relational.extension.RelationalModelExtensionAssistant.setPropertyValue(RelationalModelExtensionAssistant.java:241)
at org.teiid.designer.relational.model.RelationalModelFactory.applyProcedureExtensionProperties(RelationalModelFactory.java:789)
at org.teiid.designer.transformation.model.RelationalViewModelFactory.buildObject(RelationalViewModelFactory.java:160)
at org.teiid.designer.relational.model.RelationalModelFactory.buildFullModel(RelationalModelFactory.java:200)
at org.teiid.designer.transformation.model.RelationalViewModelFactory.build(RelationalViewModelFactory.java:110)
at org.teiid.designer.transformation.ui.actions.CreateViewProcedureAction.createViewProcedureInTxn(CreateViewProcedureAction.java:207)
at org.teiid.designer.transformation.ui.actions.CreateViewProcedureAction.run(CreateViewProcedureAction.java:182)