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 Define Material/Capacity and Time Buffers

Use

The receipt and component requirements date of a planned order that was created in the CTP process using the bucket-oriented capacity check can change during detailed scheduling. All dates must be shifted in the direction of the planned start date because the system must keep to the confirmation date. The following conditions can cause the orders to be shifted into the future and lead to date violations:

  • The closer the confirmation date of the order is to the planned start date, the less the available capacity.

  • The orders scheduled with the bucket-oriented capacity check are close to the planned start date. This will cause detailed scheduling to fail when scheduling in a backwards direction (the planned start date is met too quickly).

  • The receipt dates of most operations in a bucket lie in the first half of the bucket.

  • The required component requirements quantity is not available because the warehouse stock cannot cover the requirements quantity and the missing quantity cannot be procured in time.

The inaccuracies of the bucket-oriented capacity check in regards to requirements and availability dates can be avoided by using the material/capacity and time buffers.

Features

You can use the following parameters to define the time buffer :

  • Planning-related minimum interval

  • Time buffer at the resource

You have the following options for defining the material buffer :

  • Warehouse stock

  • Subassembly planning

You can use the following parameters to define the capacity buffer :

  • Bucket factor (capacity reduction)

You can use the following options for mapping sequence-dependent setup activities :

  • Average setup time

  • Bucket factor