Technical Trip
Schema for Usage with Travel Requests and Travel Plans 
Use
In the entry transactions of Travel Management, when a travel request is saved (in the travel manager ) or a travel plan (in the travel manager or the planning manager), for technical reasons, the relevant travel expense report is created automatically into which the system integrates the general trip data and possible advances from the travel request or travel plan. This travel expense report has the status 'request' or 'request approved'.
To ensure that the automatic creation of the expense report runs smoothly, SAP now offer in the current release the technical trip schema 'PL' that is chosen by the system as a spaceholder for the actual trip schema to be used later.
The technical trip schema 'PL' stands for a several-day trip without distinction as to domestic or international and with internal number assignment.
Later, when the user calls the travel expense report to enter his/her trip facts, he/she is requested to enter the "real" trip schema (for example, trip schema 'domestic trip'). The user does not encounter the technical trip schema 'PL'.
Effects on System Administration
If you use the travel requests in the travel manager or the transactions in Travel Planning , you have to copy the trip schema 'PL' from client 000 to your client because the settings for trip schemas are client-dependent.
Effects on Customizing
After that check the default values that are set in trip schema 'PL' and change the values if necessary. Only enter default values that exist in the relevant tables in Customizing for Travel Management.
You check and change the values in trip schema
'PL' in the IMG (implementation guide) for Travel Management under
Travel Expenses -> Dialog and Travel Expenses Control -> Dialog
Control -> 
Define schemas and individual field control
.