Suggestions:
A distinct code can be used to maintain various prices applicable for various purposes. For any purpose a different set price to be maintained, a separate price list can be created.
The pricelist values are defined for the item and its lot number. The price list values can be in decimal as well as whole numbers. When the system picks the value from the pricelist as per the reference number and if the value is in decimal then the system does not round off the value or does not show in rounded format. It is applicable as it is defined in the pricelist.