Custom field not available when importing with restricted access

When:

• The admin has created an import profile with custom fields.
• A user has permission to import contacts, but does not have permission for all custom data.

Then:

• The import shows the custom fields during the mapping process.
• But the import fails with the error message 'Invalid field: ' followed by 'field ID" for every instance of custom fields. (So, If you have four custom fields, the message reads 'Invalid field: field ID, field ID, field ID, field ID'.)

Further details are in the forum: http://forum.civicrm.org/index.php/topic,10425.0.html