The Customer Due to Buy Report displays items that your customer is due to purchase. An item is deemed "Due to Buy" based on the average number of days between purchases.
For example, if Customer A buys Item B on the first, tenth, and nineteenth of the month, the average number of days between purchases is 9.
If Customer A last ordered Item B on the first of this month, and today is the eleventh, Item B will be Due to Buy
To run
Go to Sales > Customer Due to Buy Report 
Filters
- Customer: Type the name of a specific customer, or click Customer Selection Criteria, and set a number of filters as described in Selecting data
- Product : Type the name or number of a specific product, or click Product Selection Criteria, and set a number of filters as described in Selecting data.
- Product Line Page Break: If you are including all product lines and you are generating a Detail report, then to print each product line on its own page, select this check box.
Tip: To reset selection criteria. by click the Clear Criteria button.
