Time Fence Rules for DRP, MRP, and MPS (UDC 34/TF)

Time fences are points of time at which you can make changes to either policy or operating procedures. The system uses 34/TF as the UDC for time fence rules.

For example, you can use a time fence rule for planning that calculates an ending available amount that is based on the greater of forecast or customer demand. For rules C and G, this situation means that the forecast is reduced by the amount of the customer demand on that same time bucket. The system displays all adjusted and unadjusted values. In the table, this applies to rules C, G, and H.

JD Edwards EnterpriseOne software uses the time fence rules for planning:

Rule	Description 1	Description 2	Uses
Rule C	Customer demand	Whichever is greater: forecast or customer demand	Rule C is commonly used for make-to-order, assemble-to-order, and engineer-to-order items.
Rule F	Forecast	Forecast plus customer demand	Rule F is commonly used for make-to-stock items for which forecast in Description 2 is insufficient for total demand or business policy supports the building of inventory due to volatile demand.
Rule G	Whichever is greater: forecast or customer demand	Forecast	Rule G is the default. Rule G is commonly used for make-to-stock items with accurate forecast. Description 1 in Rule G provides a hedge to prevent lost sales or backorders.
Rule H	Whichever is greater: forecast or customer demand	NA	When you use planning fence Rule H, you should set the Planning Fence field on the Manufacturing Data tab on the Additional System Information form in the Item Master program to 999. Rule H is commonly used for make-to-stock items, and it is used for forecast consumption. Forecast consumption enables you to plan for the entire planning horizon.
Rule S	Customer Demand	Forecast	Rule S is commonly used for make-to-order, assemble-to-order, and engineer-to-order items. Similar to Rule C, Rule S does not take customer demand into consideration for Description 2.
Rule 1	Zero	Forecast	Rule 1 is used when you have constraints on the shop floor that dictate the workload. Neither forecast nor customer is considered in Description 1.
Rule 3	Zero	Forecast plus customer demand	Rule 3 is similar to Rule 1; but Rule 3 is used for schedule constraints, and forecast is typically lower than total demand.

Note: With time fence rules C, G, and H, you can use the forecast consumption by customer functionality if you want to calculate net demand for an individual customer.