How To Fix RSAN_RT639 - Duplicate records when writing data to table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RSAN_RT - Messages for Runtime Analysis

• Message number: 639

• Message text: Duplicate records when writing data to table &1

What causes this issue?

An analysis process does not take uniqueness of data records
into account when processing data according to any available
key fields. A database table, however, does consider uniqueness.
When writing data to table &V1& there may only be one data record for ea
characteristic combination of key fields. If another unique index is
available in the table, the data also has to be unique according to this
index.

System Response

The analysis process terminates because not all of the data could be
written to table &V1&.

How to fix this error?

Check and change the definition of the analysis process. Using a
suitable definition of the analysis process, ensure that duplicate
records do not arise during updating, for example:
Check whether all key fields are filled correctly in the field mapping
on the data flow arrow before the data target.
Insert an aggregation node in front of the data target and aggregate
the data to fit the key fields of the data target. Use the key fields
of the data target as grouping fields in the settings for the
aggregation nodes. Use all of the other fields as aggregation fields.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSAN_RT639 - Duplicate records when writing data to table &1 ?

  The SAP error message RSAN_RT639, which indicates "Duplicate records when writing data to table &1," typically occurs in the context of data extraction or data loading processes, particularly when working with SAP BW (Business Warehouse) or SAP HANA. This error suggests that the system has encountered duplicate records that violate the uniqueness constraints of the target table.
  Cause:
  
  Duplicate Data in Source: The source data being extracted may contain duplicate records that are not being filtered out before loading into the target table.
  Incorrect Data Transformation: During the ETL (Extract, Transform, Load) process, the transformation logic may not be correctly handling duplicates.
  Primary Key Violations: The target table may have a primary key or unique index that is being violated due to the presence of duplicate records.
  Data Load Configuration: The configuration settings for the data load process may not be set to handle duplicates appropriately.
  
  Solution:
  
  Identify Duplicates: Analyze the source data to identify and understand the duplicates. You can use queries or reports to find duplicate records based on the key fields.
  Data Cleansing: Implement data cleansing processes to remove or consolidate duplicate records in the source data before loading it into the target table.
  Adjust Transformation Logic: Review and adjust the transformation logic in your data flow to ensure that duplicates are handled correctly. This may involve using aggregation functions or distinct selections.
  Modify Load Settings: Check the settings in the data load process. If applicable, configure the data load to ignore duplicates or to update existing records instead of inserting new ones.
  Check Primary Key Constraints: Ensure that the primary key constraints on the target table are correctly defined and that the incoming data adheres to these constraints.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions for this specific error message.
  Data Modeling: Review the data model in SAP BW or HANA to ensure that it is designed to handle the expected data volume and structure.
  Monitoring Tools: Utilize SAP monitoring tools to track data load processes and identify where duplicates are being introduced.
  Documentation: Refer to SAP documentation for best practices on data extraction and loading processes, especially in the context of BW and HANA.
  
  By following these steps, you should be able to resolve the RSAN_RT639 error and ensure that your data loading processes run smoothly without encountering duplicate record issues.