Specify a planning level for means of transport &1

What causes this issue?

At least one planning level must be determined for transportation lane
&V2& for means of transport &V1&. You must select either the
<ZK>aggregated planning</> or the <ZK>detailed planning</> indicator.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.