For old project, activate in studio the option "In Json configuration, manage nulls"
Engine (for vcore, need version 2025-01 after 775)
(send update with a null for Json)
curl -X POST 'https://sesvcoweud006-vcore-fa.azurewebsites.net/api/vcore/v1/stores/low-frequency.mega5/items?code=xxxxxw%3D%3D' \
-H 'maestroContext: {}' \
-H 'storeids: [low-frequency.mega5]' \
-H 'swConfigurationName: JSON' \
-d '[{
"FIELD_1":"9001",
"FIELD_2":null,
"FIELD_3":16
}]'
check old setting continue to generate "null"
check new setting generate null with "In Json configuration, manage nulls" activate
check new setting generate "nul"l with "In Json configuration, manage nulls" desactivate