Type compatibility issue for union templates
## Summary
Conversion between two templates of two different union types, that are compatible with each other, fails at runtime (RT2 only).
This issue was originally posted on the Eclipse forums: https://www.eclipse.org/forums/index.php/t/1112510/
## Steps and/or TTCN-3 code to reproduce
See example in the forum post.
## What is the current bug behavior?
Dynamic test case error during conversion.
## What is the expected correct behavior?
Successful conversion.
## Relevant logs and/or screenshots
See forum post.
## Possible fixes
Update the union template conversion function generator.
## Titan version
8.3.0
## Platform details (OS type and version)
Any
/cc @aknappqwt @mmagyari
issue