Example for Multi-Resource Planning with Primary Resource
Scenario
For a period of five weeks (W1 to W5) there are weekly requirements for two products.
Product 1 ( P1 , displayed light) can be produced on resources R1 and R2 ; the preferred resource is R1 .
Product 2 ( P1 , displayed dark) can be produced on resources R2 and R3 ; the preferred resource is R2 . On each resource a maximum of 100 pieces can be produced per week.
Step-by-step planning
The system creates planned orders for the requirements for P1 and P2 from the corresponding preferred resources R1 and R2 . This causes overloading on both resources in W5 and W1.
Note
This is the situation after the normal MRP run in the R/3 System, that is a planning run using the infinite capacities.
Backward wave : In W5 the system distributes planned orders for P2 to the alternative resource R3, until this is at full capacity. In this way the overloading in R1 and R2 in W5 is partially reduced.
The system divides the remaining overload from R1 and R2 from W5 to the preferred resources in the previous week, that is W4. The resulting overload on R1 in W4 is moved to the alternative resource R3. In W5, all resources are now at full capacity, in W4, R1 is at fully capacity, R2 at 80% capacity and R3 at 70%. In W3 and W2, the situation is not critical. In W1, there is an overload on R1 and R2, which have to be reduced.
Forward wave : In W1 the system divides planned orders for P2 to the alternative resource R3, until this is at full capacity. In this way the overloading in R1 and R2 in W1 is partially reduced.
The system divides the remaining overload from R1 and R2 from W1 to the preferred resources in the following week, that is W2. The resulting overload on R1 in W2 is moved to the alternative resource R3 and to the preferred resource R1 in W3. In this way, you reach a balanced situation, with the load on the preferred resources.
