Adding SLO using Powershell ?

Question

Hi,
I am wondering if I can use SM Lets to manually add in SLO to a Work Item.
Why i am asking is that the SCSM workflow seem not responding while the new work items created. After we have discovered the issue, we restarted the services and everything else back to normal except the Work Item created during the problem windows do not
get SLA assign to it.
I am using the Powershell below but no luck yet.
$IRClass=Get-SCSMClass -name System.WorkItem.Incident$
$IRObject=get-scsmobject -class $IRClass
$IRTarget= $IRObject| ?{$_.id -eq "IR21199"}
#Get SLA Relationship Class
$SLAInstanceRel=Get-SCSMRelationshipClass -Name System.WorkItemHasSLAInstanceInformation
$SLAId="Response Time - 001"
$SLAInformmationHash=@{"id"=$SLAId}
New-SCSMObject -Class $SLAInstanceClass -PropertyHashtable $SLAInformmationHash
$NewSLA=Get-SCSMClass $SLAInstanceClass | Get-SCSMObject -Filter "id -eq $SLAId"
New-SCSMRelationshipObject -Relationship $SLAInstanceRel -Source $IRTarget -Target $NewSLA -Bulk
The powerShell above give me error"
New-SCSMRelationshipObject : A discovery data item was rejected because the item is already bound to another Membership relationship.
At line:1 char:1
+ New-SCSMRelationshipObject -Relationship $SLAInstanceRel -Source $IRTarget -Targ ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [New-SCSMRelationshipObject], DiscoveryDataLifetimeDependencyException
    + FullyQualifiedErrorId : Microsoft.EnterpriseManagement.Common.DiscoveryDataLifetimeDependencyException,SMLets.NewSCSMRelationshipObject
Want to know if there other alternative.
Thank you.

Answer 1

The "mechanic" behind SLOs and Incidents (all Work Items) in SCSM is a little bit more complicated. Maybe this blog post from Anton is helpful:
SLA in SCSM 2012. Part 2. How it's works
In general: It's not just adding a relationship between the Incident and the SLO.
Hope this helps. 
Andreas Baumgarten | H&D International Group