SAP MM Question:

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In SAP Document Type defines different methods or procedures for a transaction. For Example: Purchase Order is transaction in SAP, but it can be done for different process so there are many document type in ME21N, like standard, framework order, stock transport order, dummy purchase order etc. So in different document type we can perform different type of function for a single transaction.

Likewise above example there are many type of document in GR and IR.