How To Fix DT243 - Field &: Data type is not allowed

DT243 - Overview

• Message type: E = Error

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

• Message number: 243

• Message text: Field &: Data type is not allowed

What causes this issue?

The data type entered is not allowed.

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?

Please check whether the domain or the data element for the field is
active. If this is the case, please check the data type entered for the
domain.

Error message extract from SAP system. Copyright SAP SE.

DT243 - Details

• The SAP error message DT243 ("Field &: Data type is not allowed") typically occurs when there is an issue with the data type of a field in a data structure, table, or program. This error can arise in various contexts, such as when defining data elements, structures, or when working with ABAP programs.
  
  Cause:
  
  Invalid Data Type: The field is defined with a data type that is not permitted in the context where it is being used. For example, using a complex data type in a context that only allows simple data types.
  Incompatible Data Types: The field may be trying to use a data type that is incompatible with the expected data type in a particular operation or function.
  Field Length Issues: Sometimes, the length of the field may exceed the allowed limits for the data type being used.
  Incorrect Field Definition: The field may not be defined correctly in the data dictionary or