Configuring Availability Check
- Availability check is an integral part of the business process that
determines if the required delivery quantity can be met on a required
delivery date. For this purpose the system takes into account pre-delivery
activities such as scheduling for picking or packing times and the time
taken to produce or obtain the material. It also performs several background
functions such as Backorder processing, rescheduling and ATP quantities.
- Backorder processing: processing of a sales order that has not been fully
confirmed or not confirmed at a certain delivery date.
- Rescheduling: is a proposal of how – confirmed quantities already
assigned to a sales order can be reassigned to other sales orders that have
a higher priority.
- Available to promise (ATP): is a process of checking the available
quantities of a material. The ATP quantity consists of warehouse stock +
planned receipts (incoming stock) – planned issues (outgoing stock). to
examine stock on hand (CO09) proceed to logistics – sales &
distribution – sales – environment – availability overview.
- Replenishment lead time (RLT): is the time taken for the material to
become available either internally (in house production) or externally (from
a vendor). The most important things to consider during an external
procurement are purchasing and MRP2 (procurement) views of MMR where the
processing time for purchasing, planned delivery time and goods receipt
processing time are taken into account. On the other hand internal
procurement is based on in house production time (MRP 2 view) goods receipt
processing time or alternatively RLT time, which is found on MRP 3 view.
- RLT (Replenishment Lead Time) is the time taken for the material to become
available. RLT is only used when doing an ATP check (Available To Promise).
The value of RLT for a material is specified on material master record.
- There are three types of availability checks –
- Check on basis of ATP quantities.
- Check against product allocation.
- Check against planning.
Configuring Availability check through Checking Groups
- The checking group + checking rule determine how the availability check is
to be performed.
- The checking group determines whether and how the system checks the stock
availability and generates requirements for material planning. The checking
group defines what type of requirements will be passed on i.e. summarized
requirements (daily/weekly) or individual requirements for each sales order.
- The checking rule applies to how the availability check is to be carried
out at the transaction level. Note that you must define checking rules for
each individual application such as for production orders for example. In
Sales and Distribution, the checking rule is specified internally within the
system and cannot be changed.
- The checking rule, in conjunction with the checking group, determines the
scope of the availability check for every business operation; that is, which
stocks, receipts and issues are to be included in the availability check and
whether the check is to be carried out with or without the replenishment
- Briefly explaining the above – checking group determines which type of
requirement to be passed on to MRP whether it be individual or summarized
and checking rule which is at the transaction level and can be configured
independently for each application module, determines which stocks, receipts
and issues to be taken into account. For performing an availability check
checking group has to work in conjunction with checking rule.
- Advantages of individual processing over summarized processing –
Backorder processing is possible.
You can access (MD04) order, line and schedule line individually which gives
a greater control on available stock and requirements placed on stock.
The system automatically uses individual requirements in case of special
- Required data for the Availability check to be carried out –
The Availability check must be switched on at the requirement class level.
The Availability check must be set at the schedule line level.
A requirements type must exist by which the requirements class can be found.
A plant must be defined in the sales order for each schedule line item (in
other words plant must be defined for every material in MMR).
A checking group must be defined in the material master record in the MRP3
screen in the availability check field.
- Configuring Availability check and defining Checking Groups –
Checking groups are introduced into the sales order based on the setting in
the material master record.
SAP standard checking groups are 01 – summarized requirements and 02 –
individual requirements or you can create your own by copying the standard
Total sales and total deliveries columns are there to configure a checking
rule to sum up requirements to post to MRP either individually or by day or
Block quantity required can be set if you want several users to be able to
process the material simultaneously in different transactions without
blocking each other.
The no check indicator is CHECKED when you DO NOT want the system to carry
out ATP check.
- Defining material block for other users – the block check box is an
indicator that enables you to block material master records of a particular
material during the availability check and restrict other users from
accessing same master record and reserve the material. If the block is not
set, two users can confirm the same material at the same time for two
different orders, not knowing if the stock is available or not. If you
select this field, the material is blocked during the availability check and
other users cannot: a) Make changes in the material master record. b) Create
purchase orders for the material. C) Create orders for the material.
- Defining default values for checking groups - Checking groups are
introduced into the sales order based on the setting in the material master
However if there is no entry present in the material master record for the
checking group, a default value can be set here, depending on material type
This default value will be used by the system depending on the material type
mentioned in MMR and plant in sales order.
If an entry exists, this default value is over written by MMR.
- Controlling Availability Check – in this section, you tell the system
what stock on hand and what inward and outward movements of stock it must
take into account when performing the availability check in addition to
whether or not to consider the replenishment lead time.
- These settings are based on the checking group that is assigned to the
material master record and the checking rule that is predefined and assigned
to the sales and distribution transaction.
- These settings carry out control both for sales order and delivery as
well. This is due to the fact that you may want to include specific stock or
incoming stock for the sales order, yet at the time of the delivery only
include physical stock on hand waiting to be shipped.
- It is possible to indicate to the system that you would like the
availability check NOT TO CHECK the stock at the storage location level.
This indicator is used to set the scope of the availability check.
- It is used to switch off the check at storage location level. You create a
reservation for a particular storage location. However, the scope of the
availability check is set in such a way as to exclude the storage location.
In this case, the system carries out the check at plant level only and does
not take the storage location into account that is specified in the
- Should you not want the system to automatically check RLT, you may
indicate so here. RLT is the time taken for a material to become available.
It is only used when doing an ATP check and is taken from MMR.
- defining the elements in the availability check entirely depends on the
business needs, but a few tips are given under –
When controlling the Availability check at the time of the sales order, a
purchase requisition does not necessarily indicate by it is going to come
into the plant.
A shipping notification on the other hand - a confirmed purchase order –
is a good indicator of receiving stock on a specified date.
It is always recommended not to select the shipping notifications for the
delivery requirements type as you may not actually receive the stock into
plant or warehouse for which you are creating a delivery.