Our Articles

Due-Date-Based Scheduling

In the system, among the three defined raw materials, material A is procured through purchasing, and its availability date has been set to April 2, 2026, at 12:00. Therefore, the work order originally planned for April 1 cannot be assigned to that date, as material A is not yet available in stock. The system automatically detects this constraint, postpones the work order to April 2, and successfully schedules (SUCCESS) all operations (Punching, Bending, Welding) according to this new start date.

On the Gantt chart, it is clearly observed that no work is scheduled on April 1 due to the fact that material A can only be procured on April 2, and all operations (Punching, Bending, Welding) are sequentially initiated starting from April 2 at 12:00.

Scheduling Under Insufficient Inventory

When the available inventory is insufficient to meet production requirements, the system cannot assign the job to the schedule. If a shortage of 5 units is detected for material A, the result is marked as LOWMATERIAL, and the job is put on hold.

Scheduling with Phantom Material

On the Material Usage Details screen, it is clearly shown how the required quantity of 10 units for material A is fulfilled. Only 2 units are covered from the available inventory, while the remaining 8 units are marked as PHANTOM STOCK REQUIREMENT. Similarly, material D is entirely fulfilled through phantom stock.

Phantom fulfillment means that when actual inventory is insufficient, the system records the requirement as a phantom stock requirement and still allows the job to be scheduled. This ensures that the production plan is not blocked, while the missing materials are tracked separately.

As shown on the Gantt chart, when the Phantom feature is enabled, the system does not treat missing materials as a blocking constraint, and all operations (Punching, Bending, Welding) are successfully scheduled on April 1.

JIT(Just In Time) MRP

The JIT MRP screen summarizes how raw material requirements are fulfilled when the Phantom feature is enabled. Out of the total requirement of 15 units, only 2 units are covered from available inventory, while the remaining 13 units are marked as PHANTOM.

Through this report, the planner can clearly see how much of each material needs to be procured or produced for jobs that are scheduled without interrupting production. Specifically, there is a requirement for 8 units of material A and 5 units of material D to be either purchased or produced.