Old selection variant & contains inbound and outbound parameters

What causes this issue?

The selection variang cannot be converted because it contains
parameters that are specific to both incoming and outgoing shipments.

System Response

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

How to fix this error?

Maintain this variant manually.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.