Scriptrunner for Jira Cloud Behaviour to Fix Version field Read-Only at a Status.groovy

// Retrieve the current context and issue key
const context = await getContext();
const issueKey = context.extension.issue.key;

// Access the fix version field. Replace this with your own custom field Id if needed.
const fixVersionField = getFieldById("fixVersions");

// Attempt to fetch the current issue data
try {
    const res = await makeRequest(`/rest/api/3/issue/${issueKey}`);
    const currentStatus = res.body.fields.status.name;

    // List of statuses where the Fix Version field should be read-only
    const restrictedStatuses = [
        "Ready for Merge",
        "Merged",
        "Ready for Production",
        "UAT",
        "Closed"
    ];

    // Determine if the field should be read-only
    const restrictFixVersionEditing = restrictedStatuses.includes(currentStatus);

    // Set the field to read-only based on the status
    fixVersionField.setReadOnly(restrictFixVersionEditing);
} catch (error) {
    // Log any errors encountered during the request
    logger.error(`Failed to retrieve issue data for ${issueKey}: ${error}`);
}