Oytun,
I notice you recently joined SCN community. Welcome aboard!
If you had read the rules of engagement, you would have noted that it is a REQUIREMENT to perform searches before actually posting a question. The question you asked in this post has been discussed countless times, and can be found by searching SCN. In addition, there are substantial amounts of information about this topic freely available in help.sap.com, and many other places on the Internet.
Here is a link to the rules of engagement. Read these FIRST!:
The SCN Rules of Engagement
Here are some links which will help sharpen you searching skills:
Search is a Tool: Tips for Better Results
Custom Google Search for the New SCN
Although SCN is filled with huge volumes of very helpful information, I personally prefer to start with help.sap.com. Since you posted this in an APO forum, I will assume you are interested in the APO ATP check, and not one of the other ATP checks that are offered by SAP software.
You might want to try
Global Available-to-Promise (Global ATP) - SAP Library
as a start.
If, after performing your searches, you still have specific questions about specific topics (FYI "ATP Check" is not a specific topic, it is a very general topic), then feel free to come back with your questions!
Best Regards,
DB49
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