Do not use a statutory trip type for the separation allowance

What causes this issue?

You have selected a statutory trip type for the business trip. This
trip type is only set up for processing separation allowances with the
Statutory Trip Type Characteristic: Separation allowance - daily
return, separation allowance for external stays, absences during
external stays, trip to start work or trip to return from work.

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?

Choose a statutory trip type that is allowed for all business trips.

Error message extract from SAP system. Copyright SAP SE.