How To Fix DT231 - Field name & is reserved (Structure cannot be used as append in DB table)

DT231 - Overview

• Message type: E = Error

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

• Message number: 231

• Message text: Field name & is reserved (Structure cannot be used as append in DB table)

What causes this issue?

In an append structure, you use a field name which is reserved by the
database.

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?

This will only cause an error if you use the structure as an append
structure in a database table.
You may not use the table as an append structure in a new database
table and also may not newly add it as an append structure to a
database table which is already active.
The table activation program rejects this because use of this database
table could cause errors, depending on the database system.
A warning is output for tables which are already active and which have
such an append structure.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT231 - Field name & is reserved (Structure cannot be used as append in DB table) ?

  The SAP error message DT231 indicates that a field name you are trying to use in a structure is reserved and cannot be used as an append in a database table. This typically occurs when you are trying to enhance a database table with a structure that contains field names that are either reserved keywords in SAP or already exist in the database table.
  
  Cause:
  
  Reserved Field Names: The field name you are trying to use is a reserved keyword in SAP. Certain names are predefined and cannot be used for custom fields.
  Existing Field Names: The field name already exists in the database table you are trying to append to. This can happen if you are trying to add a field that has the same name as an existing field in the table.
  Naming Conventions: SAP has specific naming conventions and restrictions for field names, and using names that do not comply with