OrganizationProfile.RemoveMember SharePoint 2010

[laco]

Dear ladies and gentlemen,

i try to remove a member from an organization profile in a SharePoint 2010 programm through the following method:

private void RemoveUserProfile(long departmentRecordId, long userRecordId)
{
using (SPSite site = new SPSite(SiteUrl))
{
HttpContext tmpContext = HttpContext.Current;

try
{
SPSecurity.RunWithElevatedPrivileges(delegate()
{
using (SPSite elevatedSiteColl = new SPSite(site.ID))
{
using (SPWeb web = elevatedSiteColl.OpenWeb())
{


SPServiceContext serviceContext = SPServiceContext.GetContext(elevatedSiteColl);

HttpContext.Current = null;

OrganizationProfileManager organizationProfileManager = new OrganizationProfileManager(serviceContext);

OrganizationProfile organizationProfile = organizationProfileManager.GetOrganizationProfile(departmentRecordId);

organizationProfile.RemoveMember(userRecordId);


}

}
});
}
catch (Exception ex)
{

}
finally
{
HttpContext.Current = tmpContext;
}
}
}

I receive the following exception:

System.UnauthorizedAccessException

This coding approach is working well, when reading information from OrganizationProfile.

Do you know haw to remove an UserProfile from OrganizationProfile?

Thanks a lot for your help.



Laco