How To Fix R7B151 - Conversion exit &1 used: Length reduction not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: R7B - BW Metadata (InfoCube, InfoObject, InfoObject catalog)

• Message number: 151

• Message text: Conversion exit &1 used: Length reduction not allowed

What causes this issue?

You have specified conversion exit &V1&. You have also changed the
internal length from &V2& to &V3&.

System Response

Activating the characteristic with these settings is not allowed.

How to fix this error?

Either remove this conversion exit, specify a different conversion exit
or make the internal length equal to or greater than &V2&.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message R7B151 - Conversion exit &1 used: Length reduction not allowed ?

  The SAP error message R7B151 "Conversion exit &1 used: Length reduction not allowed" typically occurs when there is an attempt to convert a value from one data type to another, and the conversion exit being used is trying to reduce the length of the data. This is not allowed in SAP, as it can lead to data loss or corruption.
  Cause:
  
  Data Type Mismatch: The error often arises when there is a mismatch between the expected length of the data type and the actual length of the data being processed. For example, if a conversion exit is defined for a field that expects a certain length, but the input data exceeds that length, the system will throw this error.
  Improper Use of Conversion Exits: If a conversion exit is applied to a field that is not compatible with the data being passed, it can lead to this error.
  Field Length Definitions: The field definitions in the database or in the data dictionary may not match the expected lengths defined in the program or function module.
  
  Solution:
  
  Check Field Lengths: Review the field definitions in the data dictionary (DDIC) and ensure that the lengths are consistent with the data being processed. Adjust the field lengths if necessary.
  Review Conversion Exits: Check the conversion exit being used (indicated by &1 in the error message) and ensure that it is appropriate for the data type and length of the field. If the conversion exit is not suitable, consider using a different one or modifying the existing one.
  Data Validation: Implement validation checks before applying conversion exits to ensure that the data being processed does not exceed the expected length.
  Debugging: If the issue persists, use debugging tools in SAP to trace the execution of the program and identify where the error is occurring. This can help pinpoint the exact data causing the issue.
  
  Related Information:
  
  Conversion Exits: These are special functions in SAP that allow for the conversion of data from one format to another, often used for formatting purposes (e.g., date formats, currency formats).
  Data Dictionary (DDIC): The central repository in SAP that contains definitions of all data elements, tables, and structures used in the system.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions to common problems.
  
  If you continue to experience issues after trying the above solutions, consider reaching out to your SAP support team or consulting the SAP community for further assistance.