Starting point is the open source version of Compiere org/compiere/process/PriceListCreate.java
This version adds column M_DiscountSchemaLine.Description and rounding options for Hundred and Thousand
Then added to this version the iDempiere changes related to use correctly the T_Selection with AD_PInstance_ID,
and the changes related to Ticket #1002354: Price List Enhancement - which added Product Costs as an option for getting the initial price
Carlos Ruiz