How To Fix AD451 - Enter a valid structure name

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 451

• Message text: Enter a valid structure name

What causes this issue?

Before starting mass activation, it is necessary to announce the ABAP/4

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Dictionary objects to be activated to the activator using one of the
allowed input media. The following possibilities exist:
1. Entry of a valid transport request or correction containing the
ABAP/4 Dictionary objects to be activated.
2. Entry of a table with the structure of table TACOB.
3. Transfer via the memory of filled internal table GENTAB with the
structure of table MAGE.
For more detailed information on the allowed input parameters, refer to
the documentation for report RDDMASG0 and to the ABAP/4 Dictionary
manual.
In this instance, none of the three input media was specified or else
the incorrect form of the chosen input medium was used.

System Response

How to fix this error?

Please check your entry.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD451 - Enter a valid structure name ?

  The SAP error message AD451 ("Enter a valid structure name") typically occurs when you are trying to access or manipulate a structure in the ABAP Dictionary (SE11) or during the development of ABAP programs, and the system cannot find the specified structure name. Here are some common causes, solutions, and related information for this error:
  Causes:
  
  Incorrect Structure Name: The structure name you entered may be misspelled or does not exist in the system.
  Namespace Issues: The structure might be in a different namespace that is not accessible to your current user or development environment.
  Transport Issues: If the structure was recently created or modified, it may not have been transported to the system you are working in.
  Authorization Issues: You may not have the necessary authorizations to view or access the structure.
  Technical Errors: There could be a technical issue with the SAP system or the database.
  
  Solutions:
  
  Verify Structure Name: Double-check the spelling of the structure name you are trying to use. Ensure that it matches exactly with what is defined in the ABAP Dictionary.
  Check Existence: Use transaction SE11 to search for the structure. If it does not exist, you may need to create it or ask someone with the appropriate permissions to do so.
  Namespace Check: Ensure that you are using the correct namespace. If the structure is in a custom namespace, make sure you have access to it.
  Transport Check: If the structure was recently created, check if it has been transported to the system you are working in. You may need to transport it or check with your Basis team.
  Authorization Check: Ensure that you have the necessary authorizations to access the structure. You may need to contact your security team to verify your permissions.
  Technical Support: If none of the above solutions work, consider reaching out to your SAP Basis or technical support team to investigate any underlying issues with the system.
  
  Related Information:
  
  Transaction Codes: SE11 (Data Dictionary), SE80 (Object Navigator), SE37 (Function Module), SE38 (ABAP Editor).
  Documentation: Refer to SAP Help Portal for detailed documentation on ABAP Dictionary and structures.
  Community Forums: SAP Community and other forums can be helpful for finding similar issues and solutions shared by other users.
  
  By following these steps, you should be able to resolve the AD451 error and successfully work with the required structure in SAP.