When controlling an installation from the command line, the SKIPPERSISTENCE property can be used to ignore default values taken from a previous installation. To ignore saved values, set the SKIPPERSISTENCE property to 1.
When applying transforms to an installation, it is a best practice to set the SKIPPERSISTENCE property to 1. If this property is not included or is set to 0 (or false), values saved from a previous installation may overwrite the values applied using the transform.