This information only concerns grouped price lists.
This field can be filled only if the price list code has been set up to limit the application of the price list according to a cumulated minimum price (depends on the setup of the price list code - if in the Price tab, the «Price/Qty» field has the value «Yes» or «Qty sections»).
The maximum value is compared with the totaled values for those lines meeting the criteria and displaying the same currency as the price list (or accepting the currency conversion).