Overwriting a price, means 'price band' field is lost.
Sometimes you need to adjust the price of an item when you are invoicing, you don't necessarily want to load a new code or apply a discount. When you you manually alter a price, or enter an Alloy price (which is left blank as it differs everytime single time) the Price Band i.e. NHS/Private is lost. This means not only are invoices/patient statements missing information, but the reporting is effected. The 'Sales by product grouped by Price Band' Report becomes an inaccurate and therfore unusable report.

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The Sales by Product Grouped by Price Band has been modified such that 'customized' prices appear on the report under 'Custom'.
Re the issue '(which is left blank as it differs everytime single time) the Price Band i.e. NHS/Private is lost.' : This cannot be 'fixed' due to the fact that if a Custom price is entered it is no longer identified as one of the existing Prices eg. NHS.
However reports and documents, will be modified such that Data is not omitted if a custom price is used.