Watch point:
Check how bucket-oriented capacity and Time-continous capacity is linked to each other.
Bucket-Oriented Capacity Check
Purpose
The bucket-oriented
capacity check is a procedure that reserves the required capacity and checks the
capacity availability of important resources for the CTP check. The
bucket-oriented capacity check is based on the PP/DS buckets
that you can create for important resources (bottleneck resources).
The main aim of the
bucket-oriented capacity check in the CTP check is the improvement of the
capacity load by avoiding a fragmented capacity load utilization; this can occur
when using finite planning based on time-continuous capacity. See also: 
Finite Scheduling Based on Time-Continuous
Capacity
Finite Scheduling Based on Time-Continuous
Capacity
The system achieves
this improvement by checking and reserving the available capacity per period
(bucket). A bucket can be one day or a week, for example. Due to the
period-oriented capacity check, the system can schedule many more orders as it
tries to use up the capacity of a bucket completely (for example, one day of 8
hours).
Advantages of
Bucket-Oriented Capacity Planning:
The system
calculates feasible delivery dates and creates the planned orders with a
relatively high capacity load utilization.
Due to the
simplified capacity check and scheduling process, the system can create the
planned orders for covering customer requirements very quickly in the CTP
process. The sales employee can give binding confirmations independently of the
production planner.
Several resources
can be scheduled finitely in a CTP check without the lead time increasing
unnecessarily.
Prerequisites
You have made the settings for the bucket-oriented capacity
check.
settings for the bucket-oriented capacity
check.Process
...
1.
You create the sales
order.
In the CTP
process, you carry out an ATP check in SAP APO for the newly received sales
orders. If the requested quantity of the product cannot be confirmed for the
desired date, the system accesses production planning and detailed scheduling.
The requirement is transferred to PP/DS.
2.
The system creates
temporary planned orders.
In PP/DS, the
system carries out a source of supply determination, a planned order explosion,
and scheduling. When scheduling the planned order, the system starts from the
desired date and schedules in a backward direction. Depending on the lot size,
the system creates temporary planned orders.
3.
The system carries
out the bucket-oriented capacity check.
The system
starts from the desired date of the order and checks in a backwards direction to
whether sufficient bucket capacity
is available for the operation. In this process, the system takes account of the
constraints, such as the relationships or desired date of the order, for
example. If sufficient capacity is available in the required bucket, the system
reserves it for the operation. At the same time, the operation is scheduled
infinitely on the time-continuous capacity. Then the system can calculate the
availability date of the planned order and calculate a confirmation
date.
If not enough
bucket capacity is available for the desired date, the system searches in a
backward scheduling direction for free capacity. If this is not successful, the
system switches to a forward scheduling direction to search for free
capacity.
4.
You save the sales
order.
5.
You carry out
detailed scheduling at a later point in time.
No time-exact
production plan is created in the bucket-oriented capacity check in the CTP
process. The operations of the orders may overlap on the resources.
If you require a
time-continuous finite production plan (with exact production dates), you must
carry out detailed scheduling. See also: Bucket-Oriented Capacity Check and Detailed
Scheduling
Bucket-Oriented Capacity Check and Detailed
Scheduling
