Parameter & missing in container of task &

What causes this issue?

The system attempted to determine the attributes of parameter &v1& in
the container of task &v2& and has found that the parameter does not
exist in the container or has not been defined correctly.

How to fix this error?

Check the task. If the task is not intended for the IDoc input, check
the inbound ALE/EDI process code.

Error message extract from SAP system. Copyright SAP SE.