How To Fix ATO305 - No class implemented for import of collection category &1.

ATO305 - Overview

• Message type: E = Error

• Message class: ATO - Adaptation Transport Organizer Messages

• Message number: 305

• Message text: No class implemented for import of collection category &1.

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 ATO305 - No class implemented for import of collection category &1. ?

  The SAP error message ATO305, which states "No class implemented for import of collection category &1," typically occurs in the context of Advanced Planning and Optimization (APO) or when dealing with the SAP Advanced Planning (AP) functionalities. This error indicates that the system is unable to find a suitable class to handle the import of a specific collection category, which is identified by the placeholder "&1".
  
  Cause:
  
  Missing Implementation: The error usually arises when there is no class implemented for the specified collection category. This could be due to a missing or incorrectly configured class in the system.
  
  Configuration Issues: There may be issues in the configuration settings related to the collection categories in the SAP system.
  Custom Development: If there are custom developments or enhancements, they may not have been properly implemented or activated.
  
  
  Solution:
  
  
  Check Class Implementation:
  
  Go to transaction SE80 (Object Navigator) or SE24 (Class Builder) and check if the class for the specified