The user interface add-on for SAP NetWeaver provides OData services through SAP Gateway. SAP Gateway offers extensive logging and tracing capabilities.
Use the SAP Gateway log viewer (transaction /IWFND/ERROR_LOG) to detect errors with SAP Fiori launchpad. You can filter the result list by namespace and service:
|/UI2/||PAGE_BUILDER_PERS||Issues with SAP Fiori launchpad|
|/UI2/||INTEROP||Issues with navigation from launchpad to application or between applications|
|/UI2/||TRANSPORT, PAGE_BUILDER_CUST, PAGE_BUILDER_CONF||Issues with SAP Fiori launchpad designer|
For more information about the logging and tracing capabilities of SAP Gateway, see Trace and Log Files in the SAP NetWeaver Gateway Technical Operations Guide.
For information on tracing in the SAP NetWeaver Business Client (NWBC), see How to Activate Tracing on SAP Help Portal at http://help.sap.com/nw_platform .