The 7.4x kernels allow you to trace the data that is being exchanged with SAP GUI for troubleshooting purposes.

sap-gui-developer-trace

The tracing of SAP GUI data can be enabled via the dynamic profile parameter rdisp/sapgui_data_trace.

The following values are supported:
0: do not trace any SAP GUI data.
1: trace SAP GUI data in case of errors only.
2: trace received SAP GUI data in processes with trace level set to 2 or 3.
3: trace sent and received SAP GUI data in processes with trace level set to 2 or 3. Also trace the received data before SNC decryption and decompression in the work process.