How To Fix B1899 - Name of internal structure too long for function module generation

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 899

• Message text: Name of internal structure too long for function module generation

What causes this issue?

The name of the internal structure is too long to meet the technical
prerequisites for generating a function module. The maximum length is 26
characters.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Copy the structure to a name with fewer than 27 characters and use this
structure to generate the function module.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1899 - Name of internal structure too long for function module generation ?

  The SAP error message B1899, which states "Name of internal structure too long for function module generation," typically occurs when the name of an internal structure exceeds the maximum length allowed by the SAP system. This can happen during the generation of function modules, particularly when the naming conventions or the structure definitions are not adhered to.
  Cause:
  
  Naming Convention: SAP has specific naming conventions and length restrictions for various objects, including internal structures. If the name of the internal structure exceeds the allowed length (usually 30 characters), this error will occur.
  Complex Structures: If you are using complex data types or nested structures, the generated names for these structures can become excessively long.
  Custom Development: This error is often seen in custom developments where developers may not be aware of the naming limitations.
  
  Solution:
  
  Shorten Structure Names: Review the names of the internal structures being used in your function module. Ensure that they are concise and do not exceed the maximum length.
  Refactor Code: If the structure names are generated dynamically or are derived from other names, consider refactoring the code to use shorter names.
  Use Type Pools: If applicable, use type pools to define shorter names for complex structures, which can help in reducing the length of the generated names.
  Check for Nested Structures: If you have nested structures, ensure that the combined length of the names does not exceed the limit.
  Review Function Module: If you are modifying an existing function module, check if any recent changes have inadvertently increased the length of the internal structure names.
  
  Related Information:
  
  SAP Documentation: Refer to the SAP documentation for guidelines on naming conventions and limitations for various objects.
  ABAP Development Guidelines: Follow the ABAP development guidelines provided by SAP to ensure compliance with naming standards.
  SAP Notes: Check for any relevant SAP Notes that may address this issue or provide additional context or solutions.
  Testing: After making changes, regenerate the function module and test to ensure that the error is resolved.
  
  By addressing the naming conventions and ensuring that the internal structure names are within the allowed limits, you should be able to resolve the B1899 error.