Why can Requesters modify the SLA of the service portfolio?

Why can Requesters modify the SLA of the service portfolio?

Dear All,

I am configuring SLA for the service catalog.
I see requesters can edit the SLA when they select a service in the list.
Logically, I understand that the new service provider decides the SLA for a service.

Not sure what I am misunderstanding or omitting here?

Thanks.

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