The optional overridePatchVersion argument enables you to override the patch version number in schema entities by specifying that all loaded entities have their patch version number set to the specified value, which can be in the range 1 through Max_Integer - 1 (that is, 2,147,483,646).
When you specify a valid value, it is effective regardless of whether patch versioning is enabled for the schema. A value of zero (0) causes the overridePatchVersion argument to be ignored. The overridePatchVersion argument is not required if you want to retain the patch number specified in the schema file.
The specified value does not have to match an existing defined patch number. If the value is the same as an existing patch number, the state of the existing patch version is ignored (that is, the existing patch number in the schema file may be closed).