if you have the scriptrunner AddOn, you can use a scripted validator
maybe like this:
import com.atlassian.jira.component.ComponentAccessor def groupManager = ComponentAccessor.getGroupManager() groupManager.isUserInGroup(currentUser, 'QA100') == false
this should return 'true' if the currentUser is not in the group 'QA100' and the validation will be passed.
Another Option would be to use a condition instead of validator.
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