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:
- Table 50149 Extension Detail Information
- Page 50149 Extension Detail Information
(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:
http://ba-consult.dk/downloads/ExtensionDetails.zip
Have fun
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