Marc:

Interesting problem. Read the other post about formatting the return value as 000.000 (whatever). Did that have any effect?

WAG = Wild Ass Guess < s > I don't know if it's official...

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>You may be right about prefixing field names. I'll check. On the other hand, I think it has to do with the joining. Probably first the tables where v_weight is not mentioned are joined, then only the virtual table. I know because I applied my favorite "divide et impera" strategy, and first did the selection on the Virtual table. It works. Thanks.
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>BTW, is WAG in the official acronym list, and if so what does it stand for ? :)