Periodic sales & purchase price maintenance

Sales and Purchase price for Items can be maintained for a specific date range.
When a sales/purchase invoice for a specific date will be posted, the system will pick the sales pricing maintained for that date.
This will also help to have a historical price data for any items.

Standard costing may not be maintained for purchased items. Instead of standard cost, moving average price (MAP) can be maintained for purchased items. Standard costs can be used for Manufactured Items. 

For purchased items, standard costing can be deactivated.

Please help, we can discuss it.