Difference between ATP & CTP

Hi guys,
Please tell me difference between ATP & CTP and its usage
ATP-->Available To Promise
CTP-->Capable To Promise
Message was edited by:
        vijai prasad shanmugam

Hi
ATP is available to promise.there are1)availbility check according to ATP logic and 2)against planned ind reqt
1.n the check according to ATP logic, the system checks whether the dependent requirements of each component are covered by specific receipt and issue elements or by stock. This check is carried out dynamically, that is, each time you carry out the check, the system recalculates the current situation. If a quantity can be committed for the requirement date, the system enters precisely this quantity as the committed quantity in the dependent requirements and the ATP quantity for the components is reduced by the committed quantity. Therefore, in the next availability check, dependent requirements can only be committed for the amount of the remaining ATP quantity.
The results of the check are displayed as follows:
as a missing parts list for the planned order (Availability check: Overview)
as either a missing parts list or a missing parts overview for the production order
2.Availability Check Against Planned Independent Requirements
check this link
http://help.sap.com/saphelp_46c/helpdata/en/41/191fdb45fd11d188ff0000e8322f96/frameset.htm
Also Check with OSS Note 455421
Regards
Dhananjay

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