Create a document in Stored Procedure raises a Partition Key error

Question

Requests originating from scripts cannot reference partition keys other than the one for which client request was submitted

I'm simply trying to create a document from a stored procedure, here is the sample code:

function sample(prefix) {
    var collection = getContext().getCollection();

    var isAccepted = collection.createDocument(
        collection.getSelfLink(),
        {tests_stored_proc: Date.now()},
        {disableAutomaticIdGeneration: false},
    function (err, item, options) {
        if (err) throw err;

        var response = getContext().getResponse();
        var body = { prefix: prefix, item: item };
        response.setBody(JSON.stringify(body));
    });

    if (!isAccepted) throw new Error('The query was not accepted by the server.');
}

I create this stored procedure from Azure Dashboard, and attempted to execute it from there as well. The container was created a long time ago at which point I don't believe partition keys had to be defined. I'm not sure which value I should provide as "Partition key" when I execute the procedure, but none of the ones I've tried have worked.

Beside creating documents, I was hoping to test whether throwing an error would cancel the creation of the documents created within the transaction. I also want to validate whether created documents can be queried within the transaction.

Thank you.