ModifyReceivedDocumentAsync doesn't work

[lorenzosacco]

Describe the bug
When calling the API ModifyReceivedDocumentAsync I always get the same error:

It.FattureInCloud.Sdk.Client.ApiException: 'Error calling ModifyReceivedDocument: {"error":{"message":"Invalid request.","validation_result":{"data.items_list.0.stock":["The data.items list.0.stock field must be true or false."]}}}'

I checked the data.items[0].stock field: it's a decimal? set to 0, it's not possible to set it to true or false

Env info

• C# version: .NET Framework 4.8
• C# SDK version: it.FattureInCloud.Sdk 2.1.1

To Reproduce
ReceivedDocumentsApi api = new ReceivedDocumentsApi(configuration);
GetReceivedDocumentResponse response = await api.GetReceivedDocumentAsync(companyID, documentID);
ReceivedDocument document = response.Data;

ModifyReceivedDocumentRequest modifyRequest = new ModifyReceivedDocumentRequest(document);
ModifyReceivedDocumentResponse reponse = await api.ModifyReceivedDocumentAsync(companyID, documentID, modifyRequest);

Expected behavior
It should work. I tried it at the API Reference web page and it's working. I believe it's a SDK bug.

Thanks for your help.
Lorenzo