Project Import does not import Custom Field Select Option values

Summary

Values for select custom fields are not imported when using the project import tool. (System > Project Import).

This is due to the fact that the import tool is expecting two internal ID's to match, which under most circumstances is the case, but can differ.

Steps to Reproduce

1. Generate an XML Backup a JIRA instance.
2. In the target environment, set up a project to import the data to.
3. Import a JIRA Project issue that uses a Custom Select list within it's configuration.
4. In some cases, the custom values will not be available.

Expected Results

When the Project is imported, that issues from the imported project contain their original values for a Select list or checkbox.

Actual Results

The issues from the project may not contain their original values from the select list or checkbox from the origin project.

Workaround

A workaround can be achieved through the steps in: Custom field values are not imported using Project Importers Tool. Please note that this workaround does involve a database change, and as a result we recommend a full backup is taken before completing the documented procedure.