For reference please see the script running for updating the category with specific groups and granting read permission:-

$groupI  = (Get-TridionGroup -GroupName "Group I").Id
$groupIRead = @{}
$groupIRead.Add($groupI, "Read")
Update-TridionCategory -WebdavUrl "webdav/C010 Dummy Schemas/Dummy" -Permissions $groupIRead -Verbose 

$groupII = (Get-TridionGroup -GroupName "Group II").Id
$groupIIRead = @{}
$groupIIRead.Add($groupII, "Read")
Update-TridionCategory -WebdavUrl "webdav/C010 Dummy Schemas/Dummy" -Permissions  $groupIIRead -Verbose 

After running the above script category is updating with only GroupII whichever group is executed at the last only with that group category is getting updated.

  • It looks like you are using Peter Kjaer's Tridion powershell module for Get-TridionGroup. Or perhaps this is your own function. Have you written Update-TridionCategory yourself? Please add the necessary information to your question. Commented Aug 10, 2016 at 8:59
  • You might find this blog post interesting. blog.indivirtual.nl/… Commented Aug 10, 2016 at 9:03

1 Answer 1


I think you're overwriting your permissions. use one update statement. add both groups to your hashtable. not tested, but I think this will work:

$groupI  = (Get-TridionGroup -GroupName "Group I").Id
$groupRead = @{}
$groupRead.Add($groupI, "Read")

$groupII = (Get-TridionGroup -GroupName "Group II").Id
$groupRead.Add($groupII, "Read")
Update-TridionCategory -WebdavUrl "webdav/C010 Dummy Schemas/Dummy" -Permissions  $groupRead -Verbose 
  • I don't have the update-tridioncategory method. can you post the source for that? Commented May 13, 2016 at 12:31
  • One more thing I missed out to mention whatever scripts you told to try first group is updating the category for 2nd group facing error preparing to add: tcm:0-000-40000 with permission:Read Added tcm:0-000-40000-to ACL preparing to add:tcm:0-001-40002 with permission:Read Update-TridionCategory:Method invocation failed because[Tridion.ContentManager.CoreService.Client.AccessControlEntryData] doesn't contain a method named 'op_Addition'.At line:1 char:2+ Update-TridionCategory -WebdavUrl "webdav/DummySchemas/Dummy CategoryInfo :InvalidOperation:(op_Addition:String)[Update-TridionCategory]
    – k951
    Commented May 13, 2016 at 13:10
  • I'm asking for the powershell source code for update-tridioncategory. I don't have that in my code base. it look like need a different approach for adding multiple groups. Commented May 13, 2016 at 14:35
  • It does indeed look like you are overwriting the permissions, but it's impossible to tell without seeing Update-TridionCategory. Commented Jun 13, 2016 at 8:40

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