Fronius: not all values available (OH3)

Hello, I’m running OpenHAB 3.1.0. I have a Fronius Symo GEN24 Plus 6.0 inverter and a Fronius Smartmeter (configured as separate meter) in my network. The smartmeter doesn’t show any values in OH, the item states are all “0”. The inverter shows all values (powers, currents, voltages, …) except for the energy counter items (day energy, year energy, total energy), they are all also zero. The inverter firmware version is 1.11.6-0. Any ideas how to fix the missing zero values?