How To Fix DDLS478 - &: A limiting target type &(&,&) is not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 478

• Message text: &: A limiting target type &(&,&) is not possible

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS478 - &: A limiting target type &(&,&) is not possible ?

  The SAP error message DDLS478 typically indicates that there is an issue with the data type or structure of a field in a database table or view that you are trying to create or modify. The message suggests that the target type you are trying to use is not compatible with the operation you are attempting to perform.
  Cause:
  
  Incompatible Data Types: The error often arises when there is an attempt to assign a data type that is not supported for the target field. For example, trying to assign a long text field to a short text field.
  Field Length Issues: If the length of the source field exceeds the maximum length allowed for the target field, this error can occur.
  Data Structure Mismatch: If the structure of the source and target fields do not match in terms of data type or attributes, this error may be triggered.
  Database Constraints: There may be constraints in the database that prevent the operation from being completed.
  
  Solution:
  
  Check Data Types: Review the data types of the fields involved in the operation. Ensure that they are compatible and that you are not trying to assign a larger data type to a smaller one.
  Adjust Field Lengths: If the issue is related to field lengths, consider adjusting the lengths of the fields to ensure compatibility.
  Modify the Structure: If you are creating or modifying a table/view, ensure that the structure of the source and target fields match in terms of data types and attributes.
  Review Database Constraints: Check for any database constraints that may be causing the issue. This could include primary keys, foreign keys, or unique constraints that are not being satisfied.
  Use Appropriate Data Types: If you are using custom data types or structures, ensure that they are defined correctly and are compatible with the target.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to this error message. SAP frequently updates its knowledge base with solutions to common issues.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to inspect the definitions of the tables and fields involved.
  Debugging: If you have access to debugging tools, you can trace the execution to see where the error is being triggered.
  Documentation: Refer to SAP documentation for guidelines on data types and structures to ensure compliance with best practices.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.