Message type: E = Error
Message class:  IQAPIX - Messages for report infosets 
Message number: 161
Message text: check class doesn't inherit from class &
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.
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.
The SAP error message IQAPIX161 indicates that there is an issue with class inheritance in your ABAP code. Specifically, it suggests that a class you are trying to use does not properly inherit from the specified parent class. This can occur in various scenarios, such as when you are trying to implement an interface or extend a class that is not correctly defined.
Cause: Incorrect Class Declaration: The class you are trying to use may not be declared correctly or may not inherit from the expected parent class. Missing Implementation: The class might be missing the implementation of required methods from the parent class or interface. Typographical Errors: There could be typographical errors in the class name or in the inheritance declaration. Visibility Issues: The parent class might not be accessible due to visibility restrictions (e.g., it is declared as private or protected).
Solution: Check Class Declaration: Verify that the class you are working with is declared
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
IQAPIX160 Please enter a name for the check class
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
IQAPIX152 Query generation: sorting and intermediate sums not taken into account.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
IQAPIX170 Please enter a name of a report transaction
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
IQAPIX171 & doesn't exist or is no report transaction
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.