[6.0] ModelBuilding: Check for navigation compatibility with keyless type w… #26090
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…hen navigation is non-null
Resolves #26073
Description
Configuring relationship from keyless entity using HasOne.WithMany API throws exception message even in valid configuration.
Customer Impact
Customer cannot build a perfectly valid model.
How found
Reported by customer in #26703
Test coverage
Added coverage for affected scenario
Regression?
Yes, from 5.0.
Risk
Low. The fix only avoid throwing exception in incorrect case.