Typically the pzinskey of the individual instances (data instances) should be entered correctly while taking a rap rule. See ifyou have a problem in them .
The other chance when you get this problem is you extract all rules from a rulesets (including data instanes associated to ruleset) and one of the data instance is corrupted. So please try taking a product rule with one ruleset after other to isolate which record is causing the issue.
I am also getting same issue while fetching all the instance of a particular data class. Even when I am trying to add the individual data instance, I can't see the instances after I hot the query button in the rap rule. Anybody has any idea on this whether this might be due the data instances got corrupted.
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