Validates that the logged in user has one of the specified project role(s)To add User in project role validator, go to the transition of your workflow, switch to Validators tab and click on Add Validator button.
Select JEP - user in project role validator and click Add button
Select the project role(s) which the the user should have to proceed the transition.
Click Add button, and that's it.
If the user is not in the allowed project role list of this validator, then it does not proceed the transition and gives an error message as below.
Do not forget to publish the workflow!