How To Fix R8155 - Primary segment &1; invalid internal data type '&2' (use type 'u')

SAP Error Message - Details

• Message type: E = Error

• Message class: R8 - Messages from the meta data generation

• Message number: 155

• Message text: Primary segment &1; invalid internal data type '&2' (use type 'u')

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message R8155 - Primary segment &1; invalid internal data type '&2' (use type 'u') ?

  The SAP error message R8155 indicates that there is an issue with the internal data type of a primary segment in a data structure or database table. Specifically, it suggests that the internal data type being used is invalid and that the system expects a type of 'u' (which typically refers to an unsigned integer).
  Cause:
  
  Invalid Data Type: The primary segment is defined with an incorrect or unsupported data type. This can happen if the data type is not compatible with the expected format or if there is a mismatch in the data definitions.
  Data Model Changes: If there have been recent changes to the data model or database schema, it may lead to inconsistencies in the data types being used.
  Custom Development: If there are custom programs or enhancements that manipulate data structures, they may inadvertently use incorrect data types.
  
  Solution:
  
  Check Data Type Definitions: Review the data type definitions for the primary segment in question. Ensure that it is defined as an unsigned integer ('u') if that is what the system expects.
  Adjust Data Structures: If you are working with custom data structures or database tables, modify them to ensure that the primary segment uses the correct data type.
  Review Code: If the error arises from custom ABAP code, check the relevant code sections to ensure that the data types being used are compatible with the expected types.
  Data Migration: If this error occurs during data migration or import, ensure that the data being imported matches the expected data types in the target system.
  Consult Documentation: Refer to SAP documentation or notes related to the specific module or functionality you are working with to understand the expected data types and structures.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide guidance on data type definitions.
  Data Dictionary: Use transaction SE11 to review the data dictionary entries for the relevant tables and structures to ensure that they are correctly defined.
  Debugging: If necessary, use the ABAP debugger to trace the execution of the program and identify where the invalid data type is being set or used.
  
  By following these steps, you should be able to identify the root cause of the error and implement the necessary changes to resolve it.