What does planning marginal code mean in SAP?

Outstanding Period: Simply put, it provides a buffer period for planners to deal with it in advance. Under the logic of reverse scheduling, for example, the start date of the planned order created by MRP is 5 days, and the open period is 3 days, then if the current date is 1st, it has not yet entered the open period, and the planner does not need to process the planned order so early, and if the current date is 3 days, it is in the open period, at this time, there will be an exception message 05 generated in MD04, which is used to prompt the planner to convert the planned order into a production order or a purchase requisition. This gives the planner enough time to process the order.

If there is no outstanding period, there will be no reminder until the 5th, and it may be too late to deal with it then.

Prenatal and postnatal buffer time: that is, the production time of some products may not be as accurate as set, allowing a certain fluctuation before or after production, such as 2 days before production and 1 day after production, so that the self-made production time of 2 days of products is allowed, as long as it is produced within 5 days. The setting of this field is based on the actual production situation, but I feel that there are not many companies that can really use it.

Release period: If there is no release period, then the release date planned by the system is the planned start date of the order, that is to say, the planner must start production just after the release, and if it is set for 2 days, then the planner can be issued 2 days in advance, and the workshop can have a certain preparation time in advance after receiving the order.

None of these fields have any limitations, they just give the plan some flexibility and tolerance.

As for the forward and backward consumption you mentioned, that's the concept of how the independent demand of the plan is offset by the sales order, and it has nothing to do with the planning margin. For example, the consumption mode is to consume 5 days backwards, then assuming that the independent demand of ** is to produce 100 on the 10th, if a sales order of 40 is received on the 12th, it can also be regarded as **accurate, then the unfinished ** is only 60. Similar forward consumption, that is, if the actual order is earlier than the **date, whether it can also be considered as **accurate, can be written off**.

Therefore, the consumption mode should be used in conjunction with the reverse consumption period or the forward consumption period to determine how many days from the ** date the order can be considered to be the ** quantity achieved.

The scheduling margin key defines some times of the plan extension, and there are four fields involved in the planning margin code, namely: open period, prenatal buffer time, postnatal buffer time, and release period (all in days).

Open Period: The planned transition date needs to be a few days earlier than the start date, if the original planned start date is 20 days, and the open period is set to 2, then the planned transition date should be 18 days.

Pre-production (or post-production) buffer time: refers to the number of days of waiting that need to be passed before (or after) the start (or completion) of honest production, and the setting of pre-production (post-production) buffer time will increase the production cycle.

Release Period: Refers to the number of days between the start of the scheduled release and the start of production. If the release period is one day, the start release date is one day earlier than the production start date.

The planning margin code can be set for the open period and the prenatal buffer and postnatal buffer.

Both MPS and MRP will maintain the MRP1 view in the master data of the copying material, and the MRP1 view - MRP process - MRP type bai field will run the main production plan.

The DU material is m0, which runs the material demand.

The PD of the Zhi plan. If the DAO system only runs the main production plan (MPS), then it will only run the demand of the material maintained as M0 in the relevant field of the material master data, and will not go to the lower level of BOM, and the material maintained as PD in the relevant field of the lower level will not run out of the demand; If you run the material requirements planning (MRP), then not only will you run out of the material requirements of M0, but also BOM, and run out of the material requirements of PD.