core data public cloud kit one to many relationship entity's attribute does not update

After the local and public database sync is done, I am trying to modify an attribute of an object which I access thru one to many relationship. Then, I save the context. This object is created by another user.
The local change does not update the public database. Is this a limitation of public database? Can it be because the object is created by another user?
core data public cloud kit one to many relationship entity's attribute does not update
 
 
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