Detail of creating IDOCs using change pointers is as follow:
1) for standard message type 2) for cutom message type
Let first discuss the flow of control for change pointers
When ever we create or change some data in SAP it will get reflected in CDHDR and CDPOS tables. By doing settings for Change pointers, this data will be transfered to other system via IDOCs. Data once processed will not be transfered again.
Now let us go through settings of Change Pointer and functioning of different components involved.