Summary

The delete option for the validator in the draft workflow is grayed out.

Cause

The corresponding Workflow has a validator set for the deleted field. Since the field has already been deleted, it displays the field attributes instead of the Validator details, and the options are grayed out. 

Solution

Follow the below steps:

1. Navigate to Issue → Workflows.
2. Make a copy of the current workflow by selecting the option Copy.
3. Edit the copied workflow and remove the transition.
4. Create the transition again.
5. Publish the workflow once the changes are made.
6. Navigate to Project Settings → Workflows → Add Workflow → Add existing and select the copied workflow
7. Select Next to choose the Issue Type to associate it with.

Note:

We are recommending copying the workflow as there are certain limitations when editing an active workflow.

1. It is not possible to edit the workflow name (only the description) if a workflow is active.
2. Workflow steps can't be deleted.
3. A step's associated Status can't be edited.
4. If a step has no outgoing transitions (Global transitions are not considered), it cannot have any new outgoing transitions added.
5. A step's "Step ID" can't be changed.