How To Fix DT290 - & cannot be used as include because it contains nested or table types

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 290

• Message text: & cannot be used as include because it contains nested or table types

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DT290 - & cannot be used as include because it contains nested or table types ?

  The SAP error message DT290 typically indicates that there is an issue with the data types being used in your ABAP program or function module. Specifically, the error message states that a certain data type cannot be used as an include because it contains nested or table types. This usually occurs when you are trying to include a structure or a data type that has nested structures or internal tables, which are not allowed in certain contexts.
  Cause:
  
  Nested Structures: The data type you are trying to include has nested structures. In ABAP, you cannot include a structure that contains another structure or an internal table.
  Internal Tables: If the data type includes an internal table, it cannot be used as an include.
  Incorrect Declaration: The data type might be declared incorrectly or is not compatible with the expected format for includes.
  
  Solution:
  
  Flatten the Structure: If possible, modify the structure to remove nested types or internal tables. You can create separate types for nested structures and use them in a flat manner.
  Use Separate Includes: If you need to use complex types, consider creating separate includes for the nested structures and use them in your main include or program.
  Check Data Type Definitions: Review the data type definitions to ensure they conform to the requirements for includes. Ensure that you are not trying to include a type that has nested or table types.
  Refactor Code: If the structure is too complex, consider refactoring your code to avoid using includes for that particular structure. Instead, you can define the structure directly in the program or function module where it is needed.
  
  Related Information:
  
  ABAP Data Types: Familiarize yourself with the different data types in ABAP, especially how structures and internal tables are defined and used.
  SAP Documentation: Refer to the official SAP documentation for guidelines on data type definitions and includes.
  ABAP Workbench: Use the ABAP Workbench (SE80) to analyze the data types and their definitions. You can also use transaction SE11 to check the data dictionary for the specific types causing the issue.
  
  By addressing the structure of your data types and ensuring they comply with the requirements for includes, you should be able to resolve the DT290 error.