SAP Message 56502 - Client &1 in System &2 uses Travel Management:

Diagnosis The program PTRV_TRAVEL_EXISTS has found entries in the TravelManagement database PTRV_PERIO in client &V1&. The system thereforeassumes that the Travel Management application is already being used. Travel Management is delivered as an extension. An extension must beactivated for it to appear in the SAP Easy Access Menu, the SAPReference IMG, and the Application Hierarchy. To be able to continue touse the Travel Management solution, you must activate the TravelManagement extension (EA-TRV) in the Reference IMG (activity: ActivationSwitch for SAP Extensions). The program PTRV_TRAVEL_EXISTS has attemptedto activate this extension automatically. Procedure For information on how to proceed, see the log.