It's not a big deal, since there is an obvious workaround, but why doesn't this work?
Bucket.PredicateExpression.Add(ProductFields.ProductId % "%" + Param.ProductId + "%");
(Param.ProductId is a string BTW)
Error 2 Argument '1': cannot convert from 'string' to 'SD.LLBLGen.Pro.ORMSupportClasses.IPredicate'
Thanks,
Phil