Dynamics N.A.V and Homogenous AppDomain Error

What an earth I hear you ask.. well that’s what I thought too.


So I have doing some development, basically I have an incoming Json feed from a Shopify Web-hook, my initial thought was to create a C# Object which I could reference as a DotNet variable in Dynamics N.A.V. the using Newtonsoft deserialize into this object.. easy.. and to be honest it was…

Until that is I got sent a request from Shopify that had an unexpected reference. Originally when I built the object class I used the samples provided by Shopify, turns out though that the sample doesn’t contain everything, so the first time a shipment notification came through that contained an order with a refund…. bam! It broke.

My original object didn’t have a Refunds section, so when I tried to deserialize it, well it didn’t know what to do.

So… I thought I would simply use a dynamic objectthen just map info I actually needed, ignoring what I didn’t, then pass this back into Dynamics N.A.V.

I added an overloaded constructor to my c# class which now looked like;

/// Ctor +1
/// </summary>
/// <param name="jsonText"></param>
public FulfillmentNotice (string jsonText)
    dynamic t = JsonConvert.DeserializeObject<dynamic>(jsonText);

    id =;
    order_number = t.order_number;
    billing_address = t.billing_address.ToObject<Address>();
    shipping_address = t.shipping_address.ToObject<Address>();

    payment_gateway_names = new List<string>();
    foreach (string s in t.payment_gateway_names)

    // init list
    shipping_lines = new List<Shipping_Lines>();
    foreach (dynamic shipline in t.shipping_lines)

    // init list
    fulfillments = new List<Fulfillment>();
    foreach (dynamic fulLine in t.fulfillments)

    // init list
    discount_codes = new List<Discount_Codes>();
    foreach (dynamic disLine in t.discount_codes)


So now I call the new constructor passing in the Json text, worked nicely, now it completely ignores anything unexpected, great!

Next I altered my codeunit within Dynamics N.A.V. to use the new code, complied then ran the function, unfortunately I got..

A call to ShopifyFulfillmentReceiver.Library.FulfillmentNotice failed with this message: Dynamic operations can only be performed in homogenous AppDomain.

Well I wasn’t really expecting that, though I thought I had seen it before.

The Solution

So what do you need to do? You need to remove/change the following file in the Microsoft.Dynamics.Nav.Server.exe.config file. Find the section <runtime> and you should see a line <NetFx40_LegacySecurityPolicy enabled=”false”/> and change it to false, restart the NST and it should work –  if the section exist, put the below withing the <configuration> section

<NetFx40_LegacySecurityPolicy enabled="false"/>

As always, you should check it on a dev instance before rolling out to a live instance, making sure it doesn’t affect anything!

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