Excursion Search is an optional step in the booking flow before Excursion Availability that allows to receive a list of available excursions according to the requested criteria. This step is supported only for the suppliers that support specific pax types. Excursion Search returns you only basic information about the excursion. To get full information about the excursion including full description(s), images, etc. you should send Excursion Descriptive Info Request to GP Travel HUB.
...
Diagram 2.1. Excursion Search in GP Travel HUB Workflow
...
All Warnings and Errors that could appear during Excursion Descriptive Info Request and Response you can see in ERROR HANDLING section.