How To Fix ADT_TTYP021 - Non-Unique Sorted

SAP Error Message - Details

• Message type: E = Error

• Message class: ADT_TTYP - ADT Table Type Editor

• Message number: 021

• Message text: Non-Unique Sorted

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ADT_TTYP021 - Non-Unique Sorted ?

  The SAP error message ADT_TTYP021: Non-Unique Sorted typically occurs in the context of ABAP development, particularly when dealing with internal tables. This error indicates that there is an attempt to sort an internal table that contains duplicate entries, which violates the requirement for a unique sort order.
  Cause:
  The error arises when:
  
  You are trying to sort an internal table that has duplicate entries based on the fields specified for sorting.
  The sorting operation expects unique entries but finds multiple entries with the same key values.
  
  Solution:
  To resolve the ADT_TTYP021 error, you can take the following steps:
  
  
  Check for Duplicates: Before sorting, ensure that the internal table does not contain duplicate entries. You can do this by using the DELETE ADJACENT DUPLICATES statement or by using a combination of SORT and DELETE ADJACENT DUPLICATES.
  SORT it_table BY field1 field2. " Sort the table
  DELETE ADJACENT DUPLICATES FROM it_table COMPARING field1 field2. " Remove duplicates
  
  
  Use Unique Keys: If the business logic allows, consider modifying the data or the sorting criteria to ensure that the entries are unique. This might involve changing the fields used for sorting or aggregating data.
  
  
  Review Sorting Logic: Ensure that the fields you are sorting by are appropriate for your use case. If you need to maintain duplicates but still want to sort, you may need to rethink your approach.
  
  
  Debugging: If you are unsure where the duplicates are coming from, you can add debugging statements or use breakpoints to inspect the contents of the internal table before the sorting operation.
  
  
  Related Information:
  
  Internal Tables: In ABAP, internal tables are used to store data in a structured way. They can be sorted and manipulated, but certain operations require unique entries.
  Sorting and Duplicates: The SORT statement in ABAP sorts the internal table based on specified fields. If duplicates exist, it can lead to errors if the subsequent operations expect unique entries.
  ABAP Documentation: For more detailed information, refer to the official SAP documentation on internal tables, sorting, and handling duplicates.
  
  By following these steps, you should be able to resolve the ADT_TTYP021: Non-Unique Sorted error and ensure that your internal table is sorted correctly without duplicates.