Pricing based On Customized fields.

Hi Guru

I have a requirement to pick up the price in the sale order based on New customed Pricing keys. I created pricing Condition tables with new customized fields.

I wan to Sale order to pick up the price from price master (VK11,VK12) based on customized fields at sales order items level.

Could please advice which user exit has to be modified to meet this requirement.

Thanks in Advance.