| Constraints for generating non-referenced purchase schedule lines |  |
| If Enterprise Planning automatically generates non-referenced purchase schedule lines, Enterprise Planning can send requirements to the Purchase Control module (generate/update schedule lines), dependent on the following constraints: Frozen zone settings. Generation horizon of the patterns. Expiry date of the contract. Firm Planned status of the schedule line. Frozen zone settings During the following frozen time zones, which are defined in the Purchase Contract Line Logistic Data (tdpur3102m000) session and/or the Items - Purchase Business Partner (tdipu0110m000) session, the Purchase Control module generates delivery moments. The delivery moments generated in the frozen time zone, can be viewed by Enterprise Planning in the Planned Delivery Moments (Shipment Based) (tdipu0125m000) session and the Planned Delivery Moments (Delivery Based) (tdipu0126m000) session, but each time interval has unique constraints for generating schedule lines: Frozen period During the frozen period, Enterprise Planning cannot generate/update schedule lines. Upper bound During the period of upper bound, the schedule line quantities can decrease, but not increase. As a result, Enterprise Planning cannot generate new schedule lines in this period. Lower bound During the period of lower bound, the schedule line quantities are allowed to increase, but not to decrease. As a result, Enterprise Planning can generate new schedule lines in this period, but existing schedule lines cannot be deleted. Note Although Enterprise Planning cannot increase the schedule line quantity in the frozen period, or during the period of upper bound, ERP LN automatically stores the demand at the first available delivery moment that falls outside these periods. If schedule lines are already generated for a specific item, dependent on the schedule line's freezing status, which you can view in the Frozen field of the Purchase Schedule - Lines (tdpur3111m000) session, during order simulation, Enterprise Planning first removes all schedule lines with the freezing status Free and for which the Firm Planned check box is cleared in the Purchase Schedule - Lines (tdpur3111m000) session. Enterprise Planning then recalculates the requirements and inserts new schedule lines. Generation horizon of the patterns In Enterprise Planning, requirements are grouped based on the delivery moments generated in the Generate Planned Delivery Moments (tdipu0225m000) session. In the Generate Planned Delivery Moments (tdipu0225m000) session, you must define a horizon end date. The horizon end date is the date until which the delivery moments are stored in the Planned Delivery Moments (Shipment Based) (tdipu0125m000) session and the Planned Delivery Moments (Delivery Based) (tdipu0126m000) session, from which the delivery moments can be called on by Enterprise Planning for lead time offsetting. Because delivery moments are not calculated for the period after the horizon end date, Enterprise Planning cannot find valid delivery moments for this period. As a result, for the period after the horzion end date, Enterprise Planning is free to plan its own delivery moments. Expiry date of the contract If requirements fall after the contract's expiry date, valid business partners can no longer be found. As a result, Enterprise Planning generates planned purchase orders without a supplier. In this case, ERP LN sends a signal to Enterprise Planning that a planned purchase order is generated instead of a schedule line. Firm Planned status of the schedule line If you click Firm Planned in the Purchase Schedule - Lines (tdpur3111m000) session, you can make a schedule line Firm Planned. If a schedule line is made Firm Planned, the schedule line cannot be changed during the next run of Enterprise Planning. Example
P1 | The frozen period.
P2 | The period of lower bound. If the frozen zone- ended before the frozen zone+, an upper bound would be applicable.
P3 | For this period, the delivery moments generated in the Generate Planned Delivery Moments (tdipu0225m000) session, which are displayed in the Planned Delivery Moments (Shipment Based) (tdipu0125m000) or the Planned Delivery Moments (Delivery Based) (tdipu0126m000) session, can be used by Enterprise Planning for lead time offsetting, and schedule lines can be generated.
P4 | The period for which no valid delivery moments are displayed in the Planned Delivery Moments (Shipment Based) (tdipu0125m000) or the Planned Delivery Moments (Delivery Based) (tdipu0126m000) session. In this period, Enterprise Planning is free to plan its own delivery moments while generating schedule lines.
P5 | The contract has expired. A planned purchase order is generated instead of a purchase schedule line.
Related topics Overview of purchase schedule handling To use planned delivery moments |