Data collection job failing every night.

We've got RTC 5.0.1, and the data collection job Work Items fails every night.  The Build, SCM, APT, Repository, and Common jobs all succeed.

In the logs, we're seeing this error

[26/03/15 0:08:08:301 CDT] 000001c8 SystemErr     R 2015/03/26 00:08:08:301 CDT [ERROR] VegaDataServices - The following com.ibm.team.reports.service.rest.exceptions.InternalRepositoryException exception was thrown while processing the url: https://alm.wcb.mb.ca/ccm/rpt/repository/workitem?fields=workitem/workItem[projectArea/archived=false]/(itemHistory/(type/id|foundIn/itemId|projectArea/itemId|teamArea/itemId|owner/uniqueId|target/itemId|resolver/uniqueId|resolution/(workflow/id|id)|category/itemId|state/(workflow/id|id|group)|severity/id|priority/id|creator/uniqueId|modifiedBy/itemId|id|itemId|uniqueId|@href|contextId|summary|tags|creationDate|modified|resolutionDate|dueDate|duration|correctedEstimate|timeSpent|stateId|predecessor|dayModified|commentCount|subscriberCount|integerComplexity|activationDate)|projectArea/archived)&modifiedsince=2015-02-20T00:00:00.000-0600&size=10&pos=80&id=_Bd_rQNN2EeSn0vZVuNjMVw

and it also says

Caused by:  [CRJAZ1316E The user "Jazz-SQL-DW-Admin" does not have permission to read items that have the Category access type.]
 <com.ibm.team.reports.service.rest.exceptions.InternalRepositoryException: Internal Repository Error>com.ibm.team.reports.service.rest.exceptions.InternalRepositoryException: Internal Repository Error

I'm going to try putting the DW Admin user into the Jazz Admins group, but I don't know if that's the right fix.  It might succeed through brute force, but I would prefer a more elegant solution if there is one.