More than one interface is assigned to structure &1

What causes this issue?

An interface in the SAP Application Interface Framework could not be
determined for this message.
For the interface structure, more than one interface has been assigned
(not only different versions but also different interface names).

System Response

The system sets the message to an error status (Application Error)
because the message could not be processed.

How to fix this error?

Check which fields should determine the interface. You may then do one
of the following:
Change the settings in Customizing for <LS>SAP Application Interface
Framework</> under <LS>System Configuration</> -> <ls>Interface
Determination</> -> <DS:SIMG./AIF/INFDETX>Define Interface Determination
for XML Interfaces </> and restart the message.
Cancel the message and send it again from the sending system (if the
data is wrong).

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.