external associations should be allowed in xpath (to certain extent)

tWith this model

The following XPaths should be valid because they only refer the join table and don’t require any data from external entities:

[MyConsumer.Local_External/MyConsumer.External]


[NOT(MyConsumer.Local_External/MyConsumer.External)]


[MyConsumer.Local_External/MyConsumer.External = $External]

Upd: same is true for non-persistable entities: their associations with regular entities must be available in XPath and not cause: is not allowed in an XPath constraint, because it starts in an entity that is not persistable