createNewVersion
Specifies whether to save the updates as a new version of the message template. Valid values are: true, save the updates as a new version; and, false, save the updates to (overwrite) the latest existing version of the template.
If you don't specify a value for this parameter, Amazon Pinpoint saves the updates to (overwrites) the latest existing version of the template. If you specify a value of true for this parameter, don't specify a value for the version parameter. Otherwise, an error will occur.