It is now possible to restrict the deletion of issues using field="Delete" in a Project workflow. As with other available restriction options, you can set this for a specific workflow status or all workflow statuses.

Example of Issue Deletion Not Allowed If Issue's Status=Closed

<Workflow initialStatus="Started">
    <Status name="Started">
            <NextStatus name="Closed"/>
    <Status name="Closed"> 
            <Restriction field="Delete" test="false"/>

The Delete option will be grayed out for users.

ISSUE ID: 14346