How To Fix DD_MT_SHARING021 - Each line of a normalized where condition must use a key field only once.

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_MT_SHARING - DDIC Multi Tenancy Sharing: Messages

• Message number: 021

• Message text: Each line of a normalized where condition must use a key field only once.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DD_MT_SHARING021 - Each line of a normalized where condition must use a key field only once. ?

  The SAP error message DD_MT_SHARING021 indicates that there is an issue with the way a normalized WHERE condition is structured in your query. Specifically, it states that each line of a normalized WHERE condition must use a key field only once. This typically occurs in the context of database queries or data modeling where the conditions applied to filter data must adhere to certain rules.
  Cause:
  The error arises when a key field (a field that uniquely identifies a record in a database table) is referenced multiple times in the WHERE clause of a query. In normalized database design, each key field should only be used once in a condition to maintain data integrity and avoid ambiguity in the results.
  Solution:
  To resolve this error, you should review the WHERE clause of your query and ensure that each key field is only used once. Here are some steps to follow:
  
  
  Identify Key Fields: Determine which fields in your WHERE condition are key fields. These are typically primary keys or fields that uniquely identify records.
  
  
  Review the WHERE Clause: Look for instances where the same key field is used multiple times. For example, if you have conditions like field1 = value1 AND field1 = value2, this would trigger the error.
  
  
  Refactor the Query: Modify the WHERE clause to ensure that each key field is only referenced once. You may need to combine conditions or adjust your logic to achieve the desired filtering without repeating key fields.
  
  
  Test the Query: After making changes, run the query again to ensure that the error is resolved and that the results are as expected.
  
  
  Related Information:
  
  Normalization: This is a database design principle that organizes data to reduce redundancy and improve data integrity. Understanding normalization can help you design better queries and avoid similar errors.
  Key Fields: Familiarize yourself with the concept of primary keys, foreign keys, and unique constraints in your database schema, as these are crucial for understanding how to structure your queries correctly.
  SAP Documentation: Refer to SAP's official documentation or community forums for additional insights and examples related to this error message.
  
  By following these steps, you should be able to resolve the DD_MT_SHARING021 error and improve the structure of your queries in SAP.