How To Fix DO834 - Key category for hashed table corrected to unique

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 834

• Message text: Key category for hashed table corrected to unique

What causes this issue?

INCLUDE DDDOC_ACCMODE_KEYKIND OBJECT DOKU ID TX
You defined a key category which is not valid for the access mode. It
is automatically corrected to the valid key category.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DO834 - Key category for hashed table corrected to unique ?

  The SAP error message DO834 indicates that there is an issue with the key category of a hashed table in your ABAP program. Specifically, it means that the key category for the hashed table has been corrected to "unique." This typically occurs when the system detects that the key defined for the hashed table does not meet the requirements for a hashed table, which requires unique keys.
  Cause:
  
  Non-Unique Keys: The primary cause of this error is that the key fields defined for the hashed table are not unique. Hashed tables require that the key fields must uniquely identify each entry in the table.
  Incorrect Table Definition: The table might have been defined incorrectly in the ABAP code, leading to the system interpreting the key as non-unique.
  Data Inconsistency: If the data being inserted into the hashed table contains duplicates for the key fields, this can trigger the error.
  
  Solution:
  
  Check Key Definition: Review the definition of the hashed table in your ABAP code. Ensure that the key fields are defined correctly and that they are intended to be unique.
  DATA: lt_table TYPE HASHED TABLE OF your_structure WITH UNIQUE KEY your_key_field.
  
  Ensure Data Uniqueness: Before inserting data into the hashed table, ensure that the data being inserted does not contain duplicates for the key fields. You can use a loop or a SELECT statement to check for duplicates.
  Change Table Type: If the nature of your data does not guarantee uniqueness, consider using a different type of internal table, such as a standard table or sorted table, which can handle non-unique keys.
  DATA: lt_table TYPE STANDARD TABLE OF your_structure.
  
  Debugging: If you are unsure where the duplicates are coming from, you can add debugging statements or use breakpoints to analyze the data being processed before it is inserted into the hashed table.
  
  Related Information:
  
  Hashed Tables: In ABAP, hashed tables are optimized for fast access based on unique keys. They are not suitable for scenarios where duplicate keys are expected.
  Performance Considerations: While hashed tables provide fast access, they come with the requirement of unique keys, which can lead to design considerations in your data model.
  Documentation: Refer to the SAP documentation on internal tables and hashed tables for more detailed information on their usage and constraints.
  
  By addressing the key definition and ensuring data uniqueness, you should be able to resolve the DO834 error message in your SAP environment.