Message type: E = Error
Message class:  /AIF/ERROR_HANDLING -  
Message number: 013
Message text: Valid interface was not found in Customizing activity "Error Handling"
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 /AIF/ERROR_HANDLING013 indicates that a valid interface was not found in the Customizing activity for Error Handling in the Application Interface Framework (AIF). This error typically arises when the system is unable to locate the necessary configuration for error handling related to a specific interface.
Cause: Missing Configuration: The interface you are trying to use does not have the required error handling configuration set up in the AIF Customizing. Incorrect Interface Name: The interface name specified in the processing logic may not match any of the configured interfaces in AIF. Transport Issues: If the configuration was recently transported from another system, it may not have been transported correctly or completely. Authorization Issues: The user may not have the necessary authorizations to access the error handling configuration.
Solution: Check Customizing Settings: Go to the AIF Customizing transaction (usually SPRO). Navigate to the relevant section for Error Handling under AIF. Ensure that the interface in question is properly configured
Get instant SAP help. Sign up for our Free Essentials Plan. 
/AIF/ERROR_HANDLING012 Duplicate selection parameter &1 found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/AIF/ERROR_HANDLING011 Invalid value entered into selection parameter &1
What causes this issue?  An invalid value has been entered as a selection parameter.System Response  The relevant program will stop.How to fix this er...
/AIF/ERROR_HANDLING014 Index table has not been customized for &1/&2/&3
What causes this issue?  There is an inconsistency in the configuration.System Response  The system issues an error message and will not allow you to ...
/AIF/ERROR_HANDLING015 Key field table has not been customized for &1/&2/&3
What causes this issue?  There is an inconsistency in the configuration.System Response  The system issues an error message and will not allow you to ...
Click on this link to search all SAP messages.