The purpose of simulating a Material Plan is to explode a Master Demand Schedule (MDS) to determine the need for opening items and capacity, to create a basis for costing, and so on.
Based on the budget for the coming year you can, for example:
When you simulate a material plan, an MDS is used as the foundation of the simulation. You can use either the valid MDS or another MDS version.
The valid master demand schedules are maintained in 'Manual Forecast/MDS. Open' (FCS350).
An MDS version is defined in 'MDS Version. Open' (MPS300). An MDS version is entered with a version designation in the range A-Z.
There are four possible origins for master demand schedules that are used for simulations:
Material plan version
The simulation environment for material plans is administered via the Material Planning (MAP) menu. Either a valid material plan or a valid material plan version can be used for a simulation.
Entering a material plan version
Material plan versions are entered in 'Material Plan Vsn. Open' (RPS050). Five versions can be specified, with a version designation range of A-E.
On panel (RPS050/F) specify the delivery plan that will be used to provide data for the material plan version.
Note that if one of the delivery plan versions in the A–Z range are used at simulation, it is not necessary to use the same version designation for the material plan version. For example, MDS version B can be used to provide input for material plan version D.
Creating a material plan version
A material plan version is created in 'Material Plan Database. Open' (RPS070). All files necessary for the simulation version are created by the system at the same time.
After the simulation is complete the database is removed from (RPS070). This is done so as not to use up memory unnecessarily.
Activating the simulation environment
When a material plan version is activated the user switches from the valid environment to a simulated environment.
A material plan version is activated via menu options that exists for the existing material plan versions in the Material Planning (MAP) menu. Specify VERA to activate version A, for example.
You will know when you are working in the simulation environment because "Simulation version" is displayed in the upper portion of the screen.
Some programs are blocked in the simulation environment - 'Req/Distr Order. Open' (MMS100) and 'Manufact Order. Enter' (PMS001), for example.
Other programs are not blocked - 'Item. Open' (MMS001) and 'Indented Bill of Material. Display' (PDS100), for example. In (MMS001) the regular item file can be maintained, but in (PDS100) only the planning file can be changed in the simulation environment.
Try to avoid changing basic data and transactions in the simulation environment (unless you intend to save the changes in an MDS) since these changes will affect the live environment.
Deactivating the simulation environment
To exit the simulation environment and return to the active environment, use the command VER.
Saving a simulated material plan
Material plans created in the simulation environment can be saved to the live environment in 'Material Plan. Calculate Regenerative' (RPS999).
In order to create the simulated material plan:
Defining a material plan version
Material plan versions are defined in 'Material Plan Vsn. Open' (RPS050).
The most important tasks to deal with at this stage are:
One of the places in which material requirement can be analyzed is 'Material Plan. Open' (MMS080). Capacity requirements can be analyzed via the Capacity Requirements Planning (CRP) menu.
The results of the simulation can be used in the following ways: