Class & does not implement BAdI Interface &

What causes this issue?

The interface used in a business add-in (BADI-Interface) has been
renamed or it was entered in another interface.

System Response

The BADI implementations already created are no longer valid with
respect to their functional part. The implementing classes do not
implement the BADI interface. Therefore, termination is triggered at
runtime. The function cannot therefore be executed properly.

How to fix this error?

If this change was communicated in the release notes, proceed as
described there. Otherwise do not proceed further. Instead, enter a CSS
message with the name of the component that is responsible for this
specific BADI.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.