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Be'Anka AshaoluBe'Anka Ashaolu 

I'd like to create a validation rule that pulls from a related list to stop or allow stage progression. Possible?

We would like to limit our users from proceeding to a certain stage if no products have been selected on an opportunity. RIght now, it doesn't appear there is a way. But it's important that products be mandated and fear they won't be used if there's no trigger to ensure they're selected. Is there a way around validation rule limitations that only work on object fields?
You create a rool-up summery field on Products to find out the total number of products. Using that field create a validation rule.
Be'Anka AshaoluBe'Anka Ashaolu
That's right! I'll do that. Thank you!
Please marke answer as best answer if it solves your question.