Thank you for the response djb.
Doing what you say, i will collect ALL instances of products with id 'A','B','C', instead i need a tuple of exactly one 'A', one 'B' and one 'C'. In my scenario, products may occur multiple times (that i forgot to say, my fault...).
I investigated a bit and posted a response myself, probably found a bug or missing implementation.
Kind regards
2010/5/19 djb <dbrownell83@hotmail.com>

You can't do any sort of constructor calls in the condition section.
i'm not sure if you're asking what goes in the ???? spot, but,
$list: ArrayList() from collect(Product(id == @{id}, ...conditions...))
perhaps?
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