IDoc type &, object type & is unknown

What causes this issue?

The system tried to read object '&v1&' of type '&v2&'. Object type
meanings:
'B': The object is a <DS:GLOS.basic_type>basistyp</>.
'I': The object is an extended basis type
(<DS:GLOS.extension>extension</> + basic type).
'E': The object is a extension.

How to fix this error?

Please check whether object &v1& is of type &v2& using the IDoc type
editor.
IF &DEVICE&='SCREEN'
<DS:TRAN.WE30>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.