How To Fix DT101 - Table & (Underscore not permitted at 2nd or 3rd position)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 101

• Message text: Table & (Underscore not permitted at 2nd or 3rd position)

What causes this issue?

The SAP naming convention reserves underlining in the second or third
position for special objects. The object which you are processing does
not belong to these special objects.

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?

Correct your entry. The second and third positions of the object name
may not contain underlining.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT101 - Table & (Underscore not permitted at 2nd or 3rd position) ?

  The SAP error message DT101 indicates that there is an issue with the naming convention of a table in the Data Dictionary (DDIC). Specifically, the error states that an underscore is not permitted in the 2nd or 3rd position of the table name. This is a restriction in SAP naming conventions to ensure that table names are valid and follow the required format.
  Cause:
  The error occurs when you attempt to create or modify a table with a name that does not comply with SAP's naming conventions. For example, if you have a table name like A_BC or AB_C, it will trigger this error because the underscore is in the 2nd or 3rd position.
  Solution:
  To resolve this error, you need to rename the table to comply with the naming conventions. Here are some steps you can follow:
  
  
  Identify the Table Name: Determine the name of the table that is causing the error.
  
  
  Rename the Table: Change the table name to ensure that there are no underscores in the 2nd or 3rd position. For example:
  
  Change A_BC to AB_C (valid) or A1BC (valid).
  Change AB_C to ABC1 (valid) or A1BC (valid).
  
  
  
  Check Naming Conventions: Ensure that the new name adheres to SAP's naming conventions:
  
  Table names should start with a letter.
  They can contain letters, numbers, and underscores, but the underscore should not be in the 2nd or 3rd position.
  The name should not exceed the maximum length allowed (typically 30 characters).
  
  
  
  Activate the Table: After renaming, activate the table in the Data Dictionary.
  
  
  Test: Ensure that the changes do not affect any existing functionality or dependencies in your SAP system.
  
  
  Related Information:
  
  SAP Naming Conventions: Familiarize yourself with SAP's naming conventions for database objects, which can be found in the SAP documentation or help files.
  Data Dictionary (SE11): Use transaction SE11 to manage and create database objects, including tables, and to check for naming issues.
  Error Handling: If you encounter similar errors in the future, refer to the SAP error message documentation for guidance on resolving naming convention issues.
  
  By following these steps, you should be able to resolve the DT101 error and successfully create or modify your table in SAP.