Use of Master Service Request

Hello,

We are using Service Request as Transaction Types for Incident that are logged by our client.

Then, per my understanding, if an deeper investigation needs to be logged on, a master service request (Problem) can be created.

What is the adding value of Master service request compared to service request? Why not creating a follow up Service request to the first one?

I have done some research on the SAP help but expect from the part that Master service request is a 'below type' of a service request, i could not get much information.

Has anyone already used it ? What are the adding functionnalities compare to service request?

Thank you,

Regards,

Anaïs