Hi @salu,

If i am following you correctly then you wanted to restrict reattachment of SLA if the AMS group reassigned to the incident. In that case you can leverage OOB field reassignment count. Reassignment count value changes [Automatically via BR] when Assignment group changes.

In your SLA you can add additional condition to existing something like below that will help you attach AMS SLA only once.

reassignment count  [is] 0 

OR

reassignment count [is] 1

I hope this helps!

Thanks & Regards,

Sharjeel