How To Fix DO859 - &: Row type as key not allowed (table type is row type)

SAP Error Message - Details

• Message type: E = Error

• Message class: DO - Dictionary: Mass activation of domains and data elements

• Message number: 859

• Message text: &: Row type as key not allowed (table type is row type)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DO859 - &: Row type as key not allowed (table type is row type) ?

  The SAP error message DO859 indicates that there is an issue with the use of a row type as a key in a table type that is defined as a row type. This typically occurs in ABAP programming when you are trying to use a structure (row type) as a key for a table that is also defined as a row type.
  Cause:
  The error arises because:
  
  In ABAP, a table type can either be a standard table, sorted table, or hashed table. When you define a table type as a row type, it means that the table is intended to hold multiple entries of a structure.
  Using a row type as a key is not allowed because keys must be unique identifiers, and row types do not provide a unique key structure.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Change the Table Type: If you need to use a key, consider changing the table type to a standard table or a hashed table, depending on your requirements. This allows you to define a unique key for the entries.
  Example:
  TYPES: BEGIN OF ty_my_structure,
           field1 TYPE string,
           field2 TYPE i,
         END OF ty_my_structure.
  
  TYPES: tt_my_table TYPE STANDARD TABLE OF ty_my_structure WITH UNIQUE KEY field1.
  
  
  Use a Key Field: If you need to keep the table type as a row type, ensure that you are not trying to use the entire row type as a key. Instead, use specific fields from the structure as keys.
  
  
  Review Data Model: Reassess your data model to ensure that the design aligns with the requirements. If you need to maintain unique entries, consider using a combination of fields as a composite key.
  
  
  Check for Typographical Errors: Ensure that there are no typographical errors in your code that might be causing the issue.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on table types and key definitions.
  SAP Community: You can find discussions and solutions related to similar issues on the SAP Community forums.
  Debugging: Use the ABAP debugger to trace the point in your code where the error occurs, which can help you understand the context better.
  
  By following these steps, you should be able to resolve the DO859 error and ensure that your ABAP code functions as intended.