Multiple Required Field Validator

With this workflow post-function, you can ensure that given fields have data before transition is executed

To add 'Multiple Required Field Validator' to a transition: 

1. Click Edit for the workflow that has the transition you wish to add the validator on.
2. In the Workflow Designer, select the transition.
3. Click on Validator in the properties panel.
4. Click on Add validator.
5. Select Multiple Required Field Validator from the list of validators.
6. Click on Add to add the validator on the transition.
7. Fill the form shown below and press 'Add' button.

Fields

Required Fields – Set here the source fields which you want to force to have data

Default Message – Set here the message you want to display o users when this validation fails.