Cannot set usageCharacteristic attribute in the Usage object

[pasquy73]

I'm trying the latest versions of TMForum APIs (1.2.7, 1.3.4, 1.3.5), but I'm unable to set the usageCharacteristic attribute. When I try to create a usage object with 2 items in the usageCharacteristic, the API is fine (Status 200 OK), but the GET call provides me this:

...
"usageCharacteristic": [
      null,
      null
  ]
...

This is quite strange because the TMForum version 0.31.2 works fine.

[wistefan]

Could you please add concrete Rest calls that you are making(e.g. the creation and the retrieval)?

[pasquy73]

Ok, this is my payload for POST call - tmf-api/usageManagement/v4/usage:

{
    "description": "This is the test with TMForum 1.3.5",
    "usageDate": "2025-07-03T16:05:18.707725700Z",
    "usageType": "VOICE",
    "status": "rejected",
    "usageCharacteristic": [
        {
            "id": "a0ba-ae64952b68ba",
            "name": "endDate",
            "valueType": "string",
            "value": "2025-06-09T10:05:18.707725700Z"
        },
        {
            "id": "448c1942-80cc-4b47-a966-0eb4e9f46724",
            "name": "CORE_hour",
            "valueType": "float",
            "value": 7.13
        }
    ],
    "ratedProductUsage": [ 
        { 
            "isBilled": false, 
            "isTaxExempt": true,
            "productRef": { 
                "id": "a22b-1c848b2a1b64", 
                "href": "https://api.csp.com/tmf-api/productInventory/v4/product/a22b-1c848b2a1b64", 
                "name": "Voicemail", 
                "@referredType": "Product" 
            }
        }
    ]
}

and this is the result of GET by ID:

{
    "id": "urn:ngsi-ld:usage:dde32b07-cb0b-48a3-9741-5aae2527c7dd",
    "href": "urn:ngsi-ld:usage:dde32b07-cb0b-48a3-9741-5aae2527c7dd",
    "description": "This is the test with TMForum 1.3.5",
    "usageDate": "2025-07-03T16:05:18.707725700Z",
    "usageType": "VOICE",
    "ratedProductUsage": [
        {
            "taxRate": 0.0,
            "productRef": {
                "id": "a22b-1c848b2a1b64",
                "href": "https://api.csp.com/tmf-api/productInventory/v4/product/a22b-1c848b2a1b64",
                "name": "Voicemail",
                "@referredType": "Product"
            }
        }
    ],
    "status": "rejected",
    "usageCharacteristic": [
        null,
        null
    ]
}

[wistefan]

Should be fixed by #101