If a user wants to update an RMA record using the REST API, use the following for that:
The API type: PATCH
Endpoint URL: https://[Account ID].suitetalk.api.netsuite.com/services/rest/record/v1/returnAuthorization/[Internal ID of the RMA record]
Request body:
{
"item": {
"items": [
{
"line": 2,
"quantity": 1
}
]
}
}