How To Fix DT255 - No type was defined for field &

DT255 - Overview

• Message type: E = Error

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

• Message number: 255

• Message text: No type was defined for field &

What causes this issue?

For the given field, you did not assign an active type and you did not
assign the data type and length by direct type entry. However, a field
requires one of these two entries.

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?

Assign an active type to the field or directly enter the data type and
length.

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 DT255 - No type was defined for field & ?

  The SAP error message DT255 ("No type was defined for field &") typically occurs when there is an issue with the data dictionary in SAP, specifically when a field in a structure or table does not have an associated data type defined. This can happen in various scenarios, such as during the creation of a new table, structure, or when modifying existing ones.
  
  Cause:
  
  Missing Data Type: The field in question has not been assigned a data type in the data dictionary.
  Inconsistent Data Dictionary: There may be inconsistencies or corruption in the data dictionary.
  Transport Issues: If the object was transported from one system to another, the data type might not have been included or defined properly.
  Custom Development: If you are working with custom developments (like Z-tables or Z-structures), the developer may have forgotten to define the data type for a field.
  
  
  Solution:
  
  
  Define the Data Type:
  
  Go to the Data Dictionary (transaction SE11).
  Locate the table