How to map AMC scenarios in SAP.
AMC can be done in serveral ways,
Create a Out Line Agreement via T code ME31K with item D and Account Assignment D.
Release the OLA via ME35K
Create the maintenance plan (IP42)
Shcedule the plan (IP10)
Get the Maintenance order number (IP24)
Goto Change mode of maintenance plan (IW32) in operation tab maintain the control key as PM03, click on External button at bottom of the screen, maitain the OLA number in purachasing screen with item number of OLA.
Then Release the order. Again goto change mode of the order and take the PR number in Operation tab by clicking ACT Data button.
Convert the PR into PO (ME21N)
After the AMC is conpleted by the vendor, create the service entry sheet against the PO. (ML81N)
Then close the order. (IW32)
If you dont want to carry lout the via Maintenance Plan, means if you want to do as on required basis, you can eliminate the steps IP42, Ip10, IP24 rest all remains same.
Hope this may give you some clarity about AMC.