LabVIEW classes not fully compatiable with polymorphic VI's

I'm just working on a set of fully object orientated drivers for a .NET assembly provided by a 3rd party that we have to integrate into our existing code.
To provide base command functionality into the .NET assembly I am using polymorphic vi's (an example of which I have attached) to allow different data types to be sent to our .NET object.
This works great except that the .lvclass when passed out of the polymorphic vi becomes invalid and I get the following error message :-
"Terminal: One or more of the inputs to this tunnel or shift register does not originate at the dynamic input front panel terminal"
This appears to be a limitation with using .lvclasses with polymorphic vi's that I can't see a way around, but thought I'd post on here just to see if anyone else has experienced this and found a way round it.
It's not critical as the polymorphic vi's are not writing to class data, only reading, but as I've always made good use of polymorphic vi's, and am now developing almost exclusively using .lvclasses I can see that it's going to be a real pain if I want to use polymorphic vi's that write to class data.
David Clark
CLA | CTA
CLA Design Ltd
Hampshire, England

Hi Jeff,
Thanks for your interest and replies to this issue.
I've played around a bit more and narrowed down the limitation - it is simply that if you use a polymorphic vi within a dynamic dispatch vi, you can pass the class handle into the polymorphic vi, but if you try and connect the output of the polymorphic vi to the dynamic dispatch output terminal it will error.
I've added a picture of a vi where this occurs - the 'send command' vi to the right is a polymorphic (with non dynamic terminals) - notice the thickness of the wires going in and out - if I then change this to a non-polymorphic vi i.e the actual vi the polymorphic links to it is fine.
I think from what you've said we're talking about the same thing, and it is a know limitation - just wanted to give you a use case for it as you requested.
David Clark
CLA | CTA
CLA Design Ltd
Hampshire, England
Attachments:
Not Working.JPG ‏61 KB

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