PRODUCT CODE, DUPLICATE ENTRIES & FILTERING OPTIONS

Sirs, two important things, 

- Need to avoid duplicate entries of products, need an urgent solution for this. keep the product code as unique, so the duplicate entry can be restricted.

- Need ‘Product Code’ also on ‘Bills’, ‘Sales Invoice’, credits, debits, returns (wherever is applicable). This'll make tracking and inventory easy, since product code is key and follow it. Also need option to filter the products entered, with the codes, names and descriptions. Without these options, it will be very difficult when we've more and more items. 

Thanks.