How To Fix RSAN_RT551 - Duplicate records when writing data to DataStore object &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RSAN_RT - Messages for Runtime Analysis

• Message number: 551

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

What causes this issue?

During data processing, one of the analysis processes does not guarantee
the uniqueness of data records in terms of the key fields they may have.
One of the DataStore objects, however, has key fields. When data is
written to DataStore object &V1&, there must only be one data record in
the key fields for each characteristic combination.

System Response

The analysis process is terminated because it is not possible to save
all the data in DataStore object &V1&.

How to fix this error?

Check the definition of the analysis process and make any necessary
changes. Redefine the analysis process in such a way so that the update
does not produce duplicate data records. You could ensure against
duplicate data records by proceeding as follows:
Check whether all key fields are filled correctly in the field
assignments on the data flow arrow that enters the DataStore object.
Insert an aggregation node in front of the DataStore object and
aggregate the data to match the key fields of the DataStoreobject. In
the settings for the aggregation node, use the key fields of the
DataStore object as grouping fields and all 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_RT551 - Duplicate records when writing data to DataStore object &1 ?

  The SAP error message RSAN_RT551 indicates that there are duplicate records being encountered when trying to write data to a DataStore Object (DSO). This typically occurs during the data loading process in SAP BW (Business Warehouse) when the system detects that the records being loaded already exist in the target DSO.
  Cause:
  
  Duplicate Data: The most common cause is that the data being loaded contains duplicate records that violate the uniqueness constraints of the DSO.
  Incorrect Data Source: The data source might be providing records that are not properly filtered or aggregated, leading to duplicates.
  Data Transformation Issues: If there are issues in the transformation process (e.g., incorrect mapping or aggregation), it can lead to duplicates being generated.
  Load Process Configuration: The configuration of the data load process might not be set up to handle duplicates correctly.
  
  Solution:
  
  Identify Duplicates: Check the source data for duplicates. You can do this by running queries or using tools to analyze the data before it is loaded into the DSO.
  Adjust Data Source: If the data source is providing duplicates, consider modifying the extraction logic to ensure that only unique records are extracted.
  Modify Transformation Logic: Review the transformation rules to ensure that they are correctly aggregating or filtering data to prevent duplicates.
  Change DSO Settings: If appropriate, you can change the DSO settings to allow for duplicate records, but this should be done with caution as it may affect data integrity.
  Use Data Cleansing Techniques: Implement data cleansing techniques to remove duplicates before loading the data into the DSO.
  Check Load Process: Review the load process configuration in the Data Transfer Process (DTP) to ensure it is set up correctly to handle duplicates.
  
  Related Information:
  
  DataStore Object (DSO): A DSO is a type of data storage in SAP BW that allows for the storage of detailed transactional data. It has unique key fields that must be maintained to avoid duplicates.
  Data Transfer Process (DTP): The DTP is responsible for transferring data from the source to the target DSO. Proper configuration is essential to avoid issues like duplicates.
  SAP BW Queries: You can create queries to analyze the data in the DSO and identify any duplicates that may exist.
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  
  By following these steps, you should be able to identify the cause of the duplicate records and implement a solution to resolve the RSAN_RT551 error.