Allow users the ability to select a date range for sales figures when creating a Purchase Order.

Currently, users are restricted to Sold Last 7, 30, 90, 120 and all time. This information, whilst partly beneficial isn't always the most useful range of figures needed when making purchasing decisions.

Example 1:

A product may be seasonal and therefore hasn't sold in the last 90 days but it's approaching the season for making an initial order. It would be useful to see what the sales figures were in the first (say) 30 days of the season for the year prior.

Example 2:

For some suppliers, we may wish to hold 14 days worth of stock and at present we need to take an average between the "Sold Last 7 days" and "Sold Last 30 days" in order to "best guess" this figure. Having the ability to see the sales for the last 14 days will allow us to make better decisions for these suppliers.