# Overrides
# Overview
The LTPS system imports most of its data from external systems and relies on it as the source of truth. Levy collection overrides provide LTPS administrators with the ability to make necessary adjustments to data for a levy collection within the LTPS system only, in the event that the source data is not able to be modified to suit LTPS purposes.
For example, the system automatically calculates the VSL levy amount payable for a provider using student and loan data obtained from the VPAYS datamart as at a certain date. It is possible, for example, to adjust the levy amount payable for a provider in the LTPS system if there was an error with the provider data as at the as at date used.