CRM 2015 - Perform specialized operations using Update

Functionality now available on release of new sdk release (7.1.a ,March 2015)

Before this release, some specialized messages should be called to update some entity fields, methods like assign request or set state request.

However, from this release on it would be able to be done from the Update message. 

Please see the below table to see what are the deprecated methods.

Deprecated message request	Attribute to update
AssignRequest	<entity>. OwnerId *
SetStateRequest	<entity>. StateCode *  Important  For   SLA   and   RoutingRule   entities, changing the   OwnerId   and   StateCode   in a single   Update   message invocation is not supported and results in an exception.
SetParentSystemUserRequest	SystemUser.ParentSystemUserId
SetParentTeamRequest	Team.BusinessUnitId
SetParentBusinessUnitRequest	BusinessUnit.ParentBusinessUnitId
SetBusinessEquipmentRequest	Equipment.BusinessUnitId
SetBusinessSystemUserRequest	SystemUser.BusinessUnitId

*<entity> refers to any entity that provides this attribute. 

Source of the information:

https://msdn.microsoft.com/en-us/library/dn932124.aspx 

Hope in helps.