How To Fix PAK028 - Create a main package only as a subpackage of a structure/main package

SAP Error Message - Details

• Message type: E = Error

• Message class: PAK - Package API / Package Tools

• Message number: 028

• Message text: Create a main package only as a subpackage of a structure/main package

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message PAK028 - Create a main package only as a subpackage of a structure/main package ?

  The SAP error message PAK028 indicates that there is an issue with the creation of a main package in the context of package hierarchy in the SAP system. Specifically, this error occurs when you attempt to create a main package that is not a subpackage of an existing structure or main package.
  Cause:
  The error is typically caused by one of the following reasons:
  
  Incorrect Package Hierarchy: You are trying to create a main package at the same level as an existing main package or outside of the defined structure.
  Package Type Misconfiguration: The system expects that main packages can only be created as subpackages of an existing main package or structure package.
  
  Solution:
  To resolve the PAK028 error, you can follow these steps:
  
  
  Check Package Hierarchy:
  
  Ensure that you are creating the main package as a subpackage of an existing main package. You can do this by navigating to the package hierarchy in the SAP system and verifying the structure.
  
  
  
  Create a Subpackage:
  
  If you need to create a new package, consider creating it as a subpackage of an existing main package instead of trying to create a new main package.
  
  
  
  Use the Correct Package Type:
  
  When creating a package, ensure that you are selecting the correct type (main package or subpackage) based on your requirements and the existing package structure.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or guidelines regarding package creation and hierarchy to ensure compliance with best practices.
  
  
  
  Check Authorizations:
  
  Ensure that you have the necessary authorizations to create packages in the specified hierarchy.
  
  
  
  Related Information:
  
  Package Types: In SAP, packages can be classified as main packages or subpackages. Main packages can contain other subpackages, but subpackages cannot contain main packages.
  Development Objects: Packages are used to organize development objects in the SAP system, and maintaining a proper hierarchy is crucial for transport management and object visibility.
  Transport Management System (TMS): Understanding how packages interact with the TMS can help in managing transports effectively.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP Basis or development team for further assistance, as they may have additional insights into your specific system configuration.