I've already mentioned the reason in an earlier post.Why can't you turn off a fire alarm circuit you can do it any time.
also the hassle of contacting fire department as some alarms ring though to them
If the client won't allow down time for certain circuits then it's a limitation on the certificate.
Do you think they want to pay for an electrician to come out after hours??
The eicr becomes less valuable shall we say if limitations are imposed but nethertheless they are acceptable and are permitted