Planning Time Fence 
Use
You can protect procurement proposals from any automatic changes to master schedule items in the near future by using the planning time fence. Within the planning time fence, the system does not automatically change procurement proposals during the planning run. That is particularly useful for MPS.
You can define the planning time fence either material-specific or per MRP group. The material-specific setting overwrites the MRP group setting.
All procurement proposal types are firmed within the planning time fence:
- planned orders
- purchase requisitions
- Delivery schedules (schedule lines).
Prerequisites
- You have entered a planning time fence:
- either on a material-specific basis in the material master
- or in Customizing for MRP or MPS in the IMG activity Define planning time fence and roll forward period.
When specifying the planning time fence, you should bear in mind the maximum lead time of the materials.
- You have defined MRP types with a firming type in Customizing for MRP or MPS in the IMG activity Check MRP types. The firming type determines how the procurement proposals are firmed and scheduled.
- You have assigned an MRP type with firming type to the material in the material master.
Features
Outside of the planning time fence, procurement proposals are created as usual in the planning run. When these procurement proposals move into the planning time fence, they are firmed automatically depending on the setting of the firming type.
The system always calculates the end date of the planning time fence dynamically starting from the planning date.