CSV import of Work Item type attribute

Hi,

I need to import new work items in RTC from a csv file. The work item data includes a required custom attribute of type Work Item. I set the values of this attribute to the ID of the linked-to work item, prefixed with a '#' (e.g. #123456). However the import fails with the error 'Attribute xyz not set' for each of the imported rows. The problem description goes "The attribute 'xyz' needs to be set" with no further details.

When I tried to update that attribute in existing work items via a csv import it worked though.

I also tried the OSLC format (https://<your-server-name>:<port>/ccm/resource/itemName/com.ibm.team.workitem.WorkItem/123456) without success.

Any clue what might be going wrong with this import?

I use RTC 6.0.4

Thank you