Accessing fields on extended types from references to parent type

#1

A field on a type is set to PartyRole.

entity type someType schema name ‘REF’ {
myPartyRole : PartyRole
calcField1 : string ‘stored calc myPartyRole.field1’
}

There are several party roles defined, and myPartyRole above can be set to any of the below.

entity type PartyRole1 extends PartyRole type key ‘PR1’ {
field1 : string
}

entity type PartyRole2 extends PartyRole type key ‘PR2’ {
field2 : int
}

I need calcField1 to be field1 when myPartyRole is a PartyRole1. I can’t seem to do this traversal - someType.myPartyRole.field1. What’s the best way to do this?

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