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If you can create a Modelsim design (source plus simulation script) that reproduces the problem, I can try a couple of Modelsim versions, including the SE subscription version.
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I reproduced the problem with 10.0c Altera Starter Edition and the full edition. Tests failed with earlier versions of Modelsim, since you have conversion functions on the ports to components (which we discussed in an earlier thread - it requires creating intermediate signals).
I defined a subtype for your integer of limited range, and then added dummy qualifications around each argument and result of the operation, and the error was still generated.
Definitely looks like a bug.
I'd recommend trying to create a minimal example with just your subtype and whatever operation leads to the error, eg., have something as simple as z <= x + y; and ramp x and y until the error is triggered. Submit that file with a SR to Mentor and to Altera.
Cheers,
Dave
Honored Contributor
