Set grid setpoint on multi rs solar duo via home assistant

I am using multi RS solar dual (v1.31) with cerebo GX (v3.80~39) and Victron, Victron GX and Modbus on Homeassistant. I want to make an automatisation to controll power on AC-in with “Grid Setpoint”. I found a MQTT entity “number.multi_rs_ac_leistungssollwert” on Home assistant, that should be N/…/settings/0/Settings/CGwacs/AcPowerSetPoint on cerebo GX MQTT, but this setting has not the vallue from victron app. maybe an old unused one.

i have also searched via dbus-spy on cerebo gx, and mqtt explorer but didnt found my set value (-123W) from victron connect app.

is there another MQTT or Modbus possibility to controll Grid Setpoint?