iControl REST / Change a setting in ASM logging profile

Hey guys,

I want to change the "maximumEntryLength" parameter in a ASM logging profile via REST. I built my URL in Postman like this

{{baseurl}}/mgmt/tm/security/log/profile/log-webservices/application

with the JSON body

{
    "kind": "tm:security:log:profile:application:applicationcollectionstate",
    "items": [
        {
            "maximumEntryLength": "10k"
        }
    ]
}

The response is

{
    "code": 403,
    "message": "Operation is not supported on property /security/log/profile/log-webservices/application.",
    "errorStack": [],
    "apiError": 1
}

I followed the the API guide here: https://clouddocs.f5.com/api/icontrol-rest/APIRef_tm_security_log_profile_application.html. I also tried a PUT or PATCH but the API tells me a 403. What am I doing wrong here? 🤔