What's the different between "Planning Horizon" and "Maximum MRP Period"?

[Former Member]

Dear Experts,

May I know what's the difference between defining a "Planning Horizon" and "Maximum MRP Period", which both of them seems work similar to me?

May I have some examples on how to use them?

Thanks,

Steven

[Former Member]

Hi,

This thread is quite old, but in case someone still needs this answer:

• The planning horizon works simply as follow: when you use the processing key 'NETCH' for MRP, the system only plans the materials in this horizon.

• The maximum MRP period is a completely different concept. It's not even a horizon. It is the maximum number of days that the system is allowed to spend without planning a material with MRP.

In fact, when you use 'NETCH', the system only runs MRP for materials that had undergone changes in their stocks or in their requirements, since the last MRP run. If they didn't, the system just ignores them (as there won't be any change in their planning). Therefore, we can set the system to run MRP regularly on some materials, even if they had no changes, using this maximum MRP period.

This parameter can be useful if you want MRP to create purchase requisitions only in the opening period, and create planned orders outside. Because you need the system to plan the material (even if it has no changes in stocks/requirements) in order to "turn" its planned orders in the opening horizon into purchase requisitions.

Regards;

[Former Member]

Hello Steven,

Planning Horizon :- Planning Horizon is used to limit the Planning only for  those materials for which requirment is there under that planning horizon.

You can maintain it using T.Code OMDX.

Maximum MRP Period:

In this step, you specify the maximum MRP interval for materials to be
planned regularly.

Regular materials planning means that these materials are planned in a
certain time interval - the maximum MRP interval - even if no changes relevant
to the planning run have occurred.

This is especially important if materials are planned using the long-term lot
size. With the maximum MRP interval you can avoid a situation where order
proposals, created with the long-term lot size, slide into the short-term area
because no changes relevant to the planning run occurred for the material.

Hope this helps

Regards