Assign destinations for the service, if all entity sets which are part of the service use
the same back-end destination. Assign destinations for the entity sets if all the entity
sets which are part of the service use different back-end destinations. If the scenario
uses function import for which you have assigned custom code as datasource, then you may
assign the destination for the custom service at the function import level.
destinations to either a service or entity sets or function imports. To assign
destinations to entity sets or function imports, remove any existing destinations
assigned for the service and vice versa.