Avoid Forgetting to Apply a Service Instance

People who have the specialist role of multiple 4me accounts used to be able to pass requests to any team of these accounts. This caused the team of the other account to receive the requests without an SLA target having been calculated for their account.

4me offered a warning when this was about to happen, but this warning was ignored at times when it really should not have been. To fix this, specialists are no longer able to assign requests to teams from other accounts unless a service instance of that account is applied to the request, or that account already had access to the request because one of its SLAs was previously linked to the request.