Developing extensions blindfolded in Dynamics NAV

Developing extensions in Dynamics NAV, it is possible to add two extensions that are adding the same field numbers to a solution.

Let’s try an example:

Now I publish and install the extension together with a page extension:

In the Extension Management, it looks like this:

Nothing new about that.

Now, let’s try to install another extension with the same field number used:

Now I publish and install the extension together with another page extension:

It is possible to publish the extension and even install it in the tenant but starting the Windows client, I get the following error:

It is not possible to start the windows client again until I have uninstalled the extension through PowerShell:

In all the workshops I have conducted until now, I have been given the question:

“How do I see which object numbers and field numbers that are already used in the solution?”

I haven’t found any standard solution to this, so I made one myself:

Install two objects:

(And No, it is not possible to create as extension due to the tables I access.)

Run the page and it will generate detailed information on all apps that are published (installed or not):

Now you can filter for the desired table:

The object can be downloaded here:

Have fun

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