How To Fix DDLS_HIER018 - Parameter propagation not allowed.

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS_HIER - Used for DDL Hierarchies

• Message number: 018

• Message text: Parameter propagation not allowed.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS_HIER018 - Parameter propagation not allowed. ?

  The SAP error message DDLS_HIER018: Parameter propagation not allowed typically occurs in the context of hierarchical data models, particularly when working with ABAP Dictionary objects like views or database tables that involve parameters. This error indicates that there is an issue with how parameters are being propagated in a hierarchical structure, which is not permitted in certain scenarios.
  Cause:
  
  
  Hierarchical Structure: The error often arises when you are trying to propagate parameters in a hierarchical structure where it is not allowed. This can happen in scenarios involving hierarchical data models, such as when using certain types of views or when defining relationships between tables.
  
  
  Incorrect Configuration: The configuration of the data model or the way parameters are defined may not support propagation. For example, if you are trying to use parameters in a way that is not compatible with the underlying data structure.
  
  
  Incompatible Data Types: Sometimes, the data types of the parameters being used may not be compatible with the expected types in the hierarchy.
  
  
  Solution:
  
  
  Review Hierarchical Structure: Check the hierarchical structure of your data model. Ensure that you are not trying to propagate parameters in a way that is not allowed. You may need to redesign the model or the way parameters are used.
  
  
  Adjust Parameter Usage: If you are using parameters in a view or a table, consider whether they can be defined differently. For example, you might need to use fixed values or different types of parameters that do not require propagation.
  
  
  Check Data Types: Ensure that the data types of the parameters are compatible with the expected types in the hierarchy. If there are mismatches, adjust the definitions accordingly.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on parameter propagation in hierarchical data models. This can provide insights into best practices and limitations.
  
  
  Debugging: If the issue persists, consider debugging the code or the data model to identify the exact point of failure. This may involve checking the SQL statements generated or the underlying data structures.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context on hierarchical data handling.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed. Other users may have encountered the same error and can provide insights or solutions.
  SAP Help Portal: Utilize the SAP Help Portal for detailed documentation on ABAP Dictionary, hierarchical data models, and parameter handling.
  
  By following these steps, you should be able to identify the cause of the error and implement a suitable solution.