Sometimes a Connector error is thrown that looks like this:
"Attempt to illegally change a value for object with id "1234567890" (ModuleName.EntityName)"
It would help if the value was specified, e.g. the name of the attribute or the name of the association:
"Attempt to illegally change value {1} for object with id "1234567890" (ModuleName.EntityName)", where {1} is the name of the attribute or association.