How To Fix RSM1129 - DataSource requires serialization; Only PSA loading allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: RSM1 - Messages for AWB, Scheduler and Monitor (new)

• Message number: 129

• Message text: DataSource requires serialization; Only PSA loading allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSM1129 - DataSource requires serialization; Only PSA loading allowed ?

  The SAP error message RSM1129 indicates that the DataSource you are trying to load data from requires serialization, which means that it can only be loaded into the Persistent Staging Area (PSA) and not directly into the InfoProvider (like a Data Warehouse or InfoCube). This is a common scenario in SAP BW (Business Warehouse) when dealing with certain types of DataSources.
  Cause:
  The error occurs due to the following reasons:
  
  DataSource Configuration: The DataSource is configured to require serialization, which is often the case for DataSources that pull data from non-SAP systems or complex data structures.
  Data Integrity: Serialization ensures that data is loaded in a controlled manner, maintaining data integrity and consistency, especially when dealing with large volumes of data or complex transformations.
  DataSource Type: Some DataSources, particularly those that involve delta loads or complex transformations, are designed to load data into the PSA first before being processed further.
  
  Solution:
  To resolve the RSM1129 error, you should follow these steps:
  
  
  Load Data into PSA: Ensure that you are loading the data into the PSA first. You can do this by executing the data load process that targets the PSA instead of the final InfoProvider.
  
  
  Check DataSource Settings: Review the settings of the DataSource in the SAP BW system. You can do this by navigating to the DataSource in the Data Warehousing Workbench (transaction RSA1) and checking the properties. Ensure that it is set up correctly for your data loading requirements.
  
  
  Process Data from PSA: After the data is successfully loaded into the PSA, you can then process it further to load it into the target InfoProvider. This can be done using a data transfer process (DTP) that reads from the PSA and writes to the InfoProvider.
  
  
  Monitor Load Processes: Use transaction RSMO (for monitoring data loads) to check the status of your data loads and ensure that they are completing successfully.
  
  
  Consult Documentation: If you are unsure about the specific DataSource and its requirements, consult the SAP documentation or the technical specifications for that DataSource.
  
  
  Related Information:
  
  PSA (Persistent Staging Area): A temporary storage area in SAP BW where data is stored before being transformed and loaded into InfoProviders.
  Data Transfer Process (DTP): A process in SAP BW that defines how data is transferred from one object to another, such as from PSA to InfoCubes or DataStore Objects (DSOs).
  DataSource Types: Different types of DataSources (like generic, SAP, or third-party) may have different loading requirements and configurations.
  
  By following these steps, you should be able to resolve the RSM1129 error and successfully load your data into the SAP BW system.