Diagnosis
You have placed the cursor on a trip and tried to create a travel plan.

System Response
The system prevents you from doing so because the selected trip alreadyhas a travel plan.

• To create a travel plan with a new trip number, select the relevant
personnel number in the list. Then choose 'Create plan'.

• To assign a travel plan to an existing trip number, select the relevant
trip number. Then choose 'Create plan'.

• To change the travel plan for an existing trip number, select the
element 'travel plan' under the relevant trip number. Then choose'Change'.