Purchase requirements for stocking purposes can be created in two ways:
Order point method
If you are using the Order point method, the requirement of a specific part is calculated based on the date the economic stock of the part will reach a pre-determined stock level (order level). When a requirement for the part is established (Economic stock < Order level), a purchase requirement is created, to ensure that the economic stock will reach the order level as a minimum.
The purchase requirement has the current date as the order date; the receipt date is the current date plus the delivery time.
The period for which the requirement is calculated is determined by the Planning horizon specified for the part, or by the To date set for the Create purchase requirements for stock parts process.
Use the order point method for stock parts of which the requirements are covered by the stock. The stock control method to be used for a part is registered on the Logistics tab of the Parts form.
Time-phased order point method
If you are using the Time-phased order point method, the requirement for a part is calculated by checking on a week-by-week basis when the expected stock of the part will reach a particular stock level (minimum stock). When a requirement for the part is established (expected stock < minimum stock), a purchase requirement is created, to ensure that the planned stock will reach the minimum level as a minimum.
The receipt date for the purchase requirement is the Monday of the week in which the part is required; the order date is the receipt date minus the delivery time.
The period for which the requirement is calculated is determined by the Planning horizon specified for the part, or by the To date set for the Create purchase requirements for stock parts process.
Use the time-phased order point method for stock parts you want to replenish based on actual requirements. The stock control method to be used for a part is registered on the Logistics tab of the Parts form.