Difference between the 3 availability checks

Dear SD experts,
Could you please explain me to understand the difference between the following 3 availability checks?
a) Available to Promise
b) Product allocation
c) Against Planning (Rule based)
In what kind of scenario, the above availability check should be carried out?  Please explain with example
Thank you
Regards
Manivannan R
[email protected]

Good Afternoon,
Check on the Basis of the ATP Quantities
The ATP quantity (ATP = Available To Promise) is calculated from the
warehouse stock, the planned inward movements of stock (production
orders, purchase orders, planned orders) and the planned outward
movements of stock (sales orders, deliveries, reservations). This type
of check is performed dynamically for each transaction, taking into
account the relevant stock and planned goods movements with or without
replenishment lead time. Planned independent requirements are not
taken into account here!!!
You can read more on this issue in SAP Library:
http://help.sap.com/saphelp_47x200/helpdata/en/6b/2785347860ea35e1000000
9b38f83b/frameset.htm
I hope information is helpful!
Martina McElwain
SD Forum Moderator
Check against planning
The check against planning is performed against independent requirements
which are usually created for an "anonymous" market rather than being
customer-specific (for example, in the strategy #Planning without
assembly#, when production occurs only up to the stocking level). The
planned independent requirements result from demand program planning and
are used for planning expected sales quantities independent of orders.
But the stock and receipt won't be included in such check!!!

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    You should always check with the manufacturer of the case to see if it will fit. You can probably do that on the manufacturers website.
    This might be of some interest to you.
    http://www.zdnet.com/ipad-4-teardown-pretty-much-the-same-as-the-ipad-3-70000068 33/

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