EDI 753, 754, 810, 812, 820, 830, 850, 856, 940, 945

Hi Gurus,

       I am a functional consultant, I have gone through EDI and configured for messages for orders,deliveries...Invoices...and i have conseptual knowledge on ALE,EDI & IDOCS .but i have seen this numbers like EDI 753, 754, 810, 812, 820, 830, 850, 856, 940, 945.....and so on....,

Can any one of you please help me in clarification of the EDI numbers....i came to know we use each number for each transaction..

So can you please give a detailed list of the Transactions and the numbers used for each transaction.

Regards

Narayana