Summary

When a field is required before a status transition, users may not be prompted to edit the field.

We can display a screen with the required field during the work item transition so the user can assign a value and the workflow continues successfully. 

Use a transition screen with a workflow validator to require field edits

Within a workflow transition, we'll set a validation where a field must have a value before changing from Status A to Status B. Now whenever you try to transition to the status, a warning message shows up in the UI:

"Transition failed. Field <your_field> is required."

Create a unique screen for the specific work item transition

1. Navigate to  Settings > Issues
2. Navigate to Screens
3. Select Add Screen and choose a memorable name and optional description
4. Search for the newly created screen and select it
5. Add your required field to the newly created screen

Add a validator to your affected project workflow

1. Navigate to your project
2. Select Project Settings > Workflows
3. Choose the workflow you want to edit, and select Edit (pencil icon)
4. Select the arrow between the affected statuses (this is the transition)
   
5. In the Transition editor window, select Validators
6. Select Add validator
7. Choose the Field Required Validator option and select Add
8. Choose your required field, and select Add
9. In the transition editor, select Edit
   
10. In the transition view field, select the screen that was created
11. Select Update
12. Publish the new workflow version by selecting Publish Draft at the top of the page