Modbus write error

[didac]

Hello,
I have a problem. I updated genohm-scada-modbus package version 20230404 to 20240621 and FW version 20230607 to 20240426. Now I run a write command and I get this error: "Write failed: Illegal data value". The only change in Modbus profile is to add write_delay:1 in the file header. I also tried package 20231213 and I have the same error. The error doesn't always occur, ometimes write correctly. It is possible to know which mapping element triggers the error?

Code:

{
  "manufacturer": "TEST",
  "description": "Modbus",
  "timeout": 5,
  "read_swap": "n", 
  "write_delay":1,
  "mapping": [
        {"name": "Allow Heating_[R/W]",
    "bus_datatype": "bool",
    "type": "register",
    "datatype": "uint16",
    "address": 47371,
    "writable": 1,
    "write_multiple": 1,
    "read_count": 1,
    "value_delta": 1,
    "value_multiplier": 1,
    "value_custom": {
            "0": "Off",
            "1": "On"
            }     
    },
    {"name": "Allow Cooling_[R/W]",
    "bus_datatype": "bool",
    "type": "register",
    "datatype": "uint16",
    "address": 47372,
    "writable": 1,
    "write_multiple": 1,
    "read_count": 1,
    "value_delta": 1,
    "value_multiplier": 1,
    "value_custom": {
            "0": "Off",
            "1": "On"
            }         
    }
]}