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Issue:

You would like to understand the logic for the default document type in ME51N.

Solution: 

System takes default document type for Purchase Requisition (PR) according to following priority:

  1. Settings"Personal Setting" in T-code ME51N.
  2. "Default Purchasing Document Type in Transactions" for T-code ME51N in customizing table T160 (T-code OLME -> Define Default Values for Document Type).
  3. User parameter "BBA" in T-code SU01 or SU3.
  4. The first available document type in customizing table T161 (T-code OLME -> Purchase Requisition -> Define Document Types).

Please refer to note 1906048 for more detailed information.

Related notes / content:

1906048 ME51N : Default document type value is not taken from user parameter BBA