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3084390 - System error during preparation of the data transfer, Error: Too many "DATA" control blocks generated (ABAP error GEN_TOO_MANY_CBS) - Migration Cockpit - Migrate Your Data Fiori App


You are using the SAP S/4HANA migration cockpit (Migrate Your Data – Migration Cockpit app) to migrate data to SAP S/4HANA or SAP S/4HANA Cloud. With migration approach Migrate Data Using Staging Tables, you copied a large number of migration objects or many large objects to a project. When you start an action (such as the preparation step, the simulation, or the migration), a system error occurs. 


Related error messages: 

For SAP S/4HANA Cloud and SAP S/4HANA systems, in the Migrate your Data –Migration Cockpit Fiori app, on the Monitoring screen → Show messages:

  • “System error during preparation of the data transfer” /LTB/MC, Message no. 68 

For SAP S/4HANA systems (On–Premise), transaction ST22:  

  • ABAP Programming error: GEN_TOO_MANY_CBS, Short Text: Too many "DATA" control blocks generated 



  • SAP S/4HANA 
    • "Migrate Your Data – Migration Cockpit" app 
      • Migrate Data UsingStagingTables
  • SAP S/4HANA Cloud
    • "Migrate Your Data – Migration Cockpit" app 
      • Migrate Data UsingStagingTables 


SAP S/4HANA Cloud all versions ; SAP S/4HANA all versions


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