IDOC CREATION?

1.what is process code in an IDOC CREATION?

2.Why do we need to associate process code and function module?

2.Can we perform the whole IDOC creation manually by using transactions or we need to write an abap report in SE38 seperately? if so why?

3.What does this report do?

4.i need to discuss in details......can any one contact me plz

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