The Call Service specifies for the ObjectId parameter that "The NodeId shall be that of the Object or ObjectType that is the source of a HasComponent Reference (or subtype of HasComponent Reference) to this Method."

Propose to reduce or narrow this restriction.

In many if not in most cases, methods are defined on the type and not individually for each instance.
With this requirement in place, however, clients will always have to browse for methods just to be sure.
Without this requirement, clients could program against the type. I.e. they would specify the MethodId from the type and specify the instance upon which the method shall execute in the ObjectId parameter.

See also the A&C specification where we define exceptions:
"all Servers shall allow Clients to call the Acknowledge Method by specifying ConditionId as the ObjectId and the well known NodeId of the Method declaration on the AcknowledgeableConditionType as the MethodId"