The days’ supply of a material indicates how long a material will cover requirements if you only take current plant stock into account.

The receipt days’ supply of a material indicates how many days the stock will last if stock that you are certain to receive is also taken into account. You can define two different receipt days’ supplies. You can thus define, for example, that with receipt days’ supply 1, all possible receipt elements are to be taken into account, whereas with receipt days’ supply 2, only the absolutely certain receipt elements, such as shipping notifications and production orders, are taken into account.

By using these range of coverage types, the work scheduler is able to see whether any further action is required for a material.

The system calculates the days’ supplies in every planning run and every time the current stock/requirements list is called up.

The system displays both of these types of days’ supply in the planning results, in the material overviews in collective access and in the header details in the MRP list and the current stock/requirements list.

In the collective display of the MRP list, you can use these key figures to select MRP lists.

You can define the receipt elements that are to be taken into account for the receipt days’ supply 1 and 2 in the IMG activity Define receipt elements for the receipt days’ supply in Customizing for MRP.

In Customizing, you define the receipt elements that the system is to take into account when calculating the receipt days’ supply 1 and 2.

In the case of in-house production, you have the choice between production/process orders and firmed planned orders and as of Release 4.5A assigned planned orders. Assigned planned orders are planned orders that have been assigned a production version. In repetitive manufacturing, this corresponds to the manufacturing of a particular production line.

For calculating the days’ supply and receipt days’ supply, you define in the Safety stock field in Customizing whether the system is to use the safety stock or the actually available stock to determine the number of days that a material will cover requirements.

If the safety stock is to be taken into account, the system calculates the number of days until the stock level falls below the safety stock level. If only the actually available stock is to be taken into account, the system calculates the number of days until the stock level falls below 0.