Errors are validations which we (or the server) regard as showstoppers, and we do not consider a missing flow validation warning a showstopper.
Given that you can sort by each of the columns in the validation view, it should not be difficult to locate any specific type of validation. We're also planning to add a feature which will allow you to hide/ignore specific validations instances (i.e. a specific validation in a specific location, such as those 100 pesky warnings you mention) so that they will not appear when you re-validate your model.
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