You can think of this module as product_listprice_upgrade v2.
The aim of this module is to allow the automatic update of the price fields of products.
* added a new pricelist type called 'Internal Pricelist' (currently, we have only 2 pricelist types: Sale and Purchase Pricelist)
* Created a wizard button in the menu Products>Pricelist called 'Update Product Prices'
* After filling in the wizard form and clicking on 'Update', it will change the selected price field of all products in the categories that we were selected in the wizard.
Compatibility: tested with OpenERP v5.0