How To Fix DT285 - Prefix for field name & is not valid

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 285

• Message text: Prefix for field name & is not valid

What causes this issue?

The selected field name has a prefix which is not known in the current
system.

System Response

The table is not activated.

How to fix this error?

Choose a field name from a prefix namespace which is allocated to you.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT285 - Prefix for field name & is not valid ?

  The SAP error message DT285, which states "Prefix for field name & is not valid," typically occurs in the context of data dictionary objects, particularly when dealing with field names in structures, tables, or data elements. This error indicates that the prefix used for a field name does not conform to the naming conventions or rules defined in the SAP system.
  Causes:
  
  Invalid Prefix: The prefix used for the field name does not match the expected prefixes defined in the system. SAP has specific naming conventions for different types of fields.
  Field Name Length: The field name may exceed the maximum length allowed by SAP.
  Reserved Keywords: The field name may be using a reserved keyword or a name that is not allowed.
  Incorrect Data Element: If the field is based on a data element, the data element itself may have an invalid prefix.
  
  Solutions:
  
  
  Check Naming Conventions: Ensure that the prefix used for the field name adheres to SAP's naming conventions. Common prefixes include:
  
  Z or Y for custom fields.
  Standard prefixes for SAP standard fields.
  
  
  
  Modify Field Name: If the prefix is invalid, change the field name to use a valid prefix. For example, if you are creating a custom field, start the name with Z or Y.
  
  
  Review Data Element: If the field is based on a data element, check the data element's properties to ensure it has a valid prefix.
  
  
  Field Name Length: Ensure that the field name does not exceed the maximum length (typically 30 characters).
  
  
  Consult Documentation: Refer to SAP documentation or guidelines for naming conventions to ensure compliance.
  
  
  Transport Request: If the error occurs during a transport, ensure that the transport request is correctly configured and that all objects are included.
  
  
  Related Information:
  
  SAP Naming Conventions: Familiarize yourself with SAP's naming conventions for fields, tables, and structures.
  Data Dictionary (SE11): Use transaction SE11 to check the definitions of data elements, tables, and structures.
  ABAP Development Guidelines: Review the ABAP development guidelines for best practices in naming and structuring your code.
  
  If the issue persists after checking these aspects, consider reaching out to your SAP Basis or development team for further assistance.