Lynda,
If you are currently using GATP, and you decide to stop using it, then you will have to think about how you wish to perform ATP after the change. By default, ATP processing will revert to ECC. You should make sure that whatever ATP you will be left with in ECC will meet your client's requirements. Speak to your SD functional expert for details of configuring Sales ATP; and your PP functional expert about PP ATP.
There may be jobs currently running in ECC that are designed to support the current APO solution. You need to speak to the architect who designed this APO solution to determine which (if any) jobs exist, and which (if any) should be un-released.
You can stop any APO processing by deactivating the Integration models. CFM2 in ECC. Probably a good idea also to turn off Publishing in APO. In APO SM30 > View /SAPAPO/CIFDSTRV.
You should create a formal Test Plan, and have the business users test both the go-live process, and the subsequent day-to-day business processing, in your quality system, before considering go-live. It is important that all appropriate business groups know when the change will take place, and what to expect after the change is performed. The cutover is best done during time of low activity. You would typically use your standard project management techniques to ensure that all "i's" are dotted and all "t's" crossed.
Best Regards,
DB49
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