Tip #60 | Suppress Warnings in Visual Studio Code

One of the most anoying things about writing AL code in Visual Studio Code is getting warnings that you cannot fix. Simply impossible.

My “favorite” warning is this one

For almost a decade it’s been possible to sort on flowfields from code and in reports and in most cases it works fine. On larger datasets it might require a covering index for performance.

This warning is a joke because it suggests to add a flowfield to the key’s. Even if it were a normal field; in extensions you cannot influence keys in Base Application anyway.

It’s recommended to fix this per project and to do this you need to add a settings.json file to your .vscode folder like this:

The content of this file should be something like this:

    "name": "ForNAV",
    "description": "ForNAV Rules",
    "generalAction": "Hidden",
    "rules": [
            "id": "AL0432",
            "action": "Hidden",
            "justification": "Marked for removal, be careful with this rule…"
            "id": "AL0254",
            "action": "Hidden",
            "justification": "Not possible to solve"

Tip #59 | Multiple Start Configurations in Visual Studio Code

When developing extensions for Business Central you have a wide array of publishing options to choose from.

My most used options when working on the ForNAV Customizable Report Pack are our Sandbox and Docker.

Testing is best on the Sanxbox for two reasons. First because all the Azure Active Directory stuff actually returns something which is useful for licensing scenario’s. Second because you can easily share the result with the team since everyone is on the same Sandbox.

Docker is useful when you don’t want to test on current but on an older or vNext instance.

Lastly it’s also possible to install Business Central on your own infrastructure altough this is a dying species.

In your Visual Studio Code project you can specify how you want to publish in the launch.json file but did you also know you can setup miltiple configurations and then choose one at the time of publishing.

This is how it could look:

     "version": "0.2.0",
     "configurations": [
             "type": "al",
             "request": "launch",
             "name": "Docker",
             "authentication": "UserPassword",
             "startupObjectType": "Page",
             "breakOnError": true,
             "launchBrowser": true,
             "server": "http://bcsandbox",
             "serverInstance": "NAV",
             "enableLongRunningSqlStatements": true,
             "enableSqlInformationDebugger": true,
             "schemaUpdateMode": "Synchronize"
        "type": "al",
        "request": "launch",
        "name": "Microsoft cloud sandbox",
        "startupObjectId": 6188475,
        "startupObjectType": "Page",
        "breakOnError": true,
        "launchBrowser": true,
        "enableLongRunningSqlStatements": true,
        "enableSqlInformationDebugger": true,
        "schemaUpdateMode": "Synchronize"

Now if you publish your code Visual Studio Code will ask for the correct configuration.

NOTE: Your credentials cache is shared accross these configurations. You will need to clear the credentials cache if you switch.

TIP: You can also use this to create a seperate config for Syncronize and Recreate.

Tip #58 | Run Extension Objects

One of the quirks of working with extensions is that you cannot run an object from the object designer. This is true for V1 and V2.

With V2 you can start an object (page) after deploy but this only works once and only in the WebClient.

If you just quickly want to check our a page or codeunit in the Windows client you can write a codeunit against an object that does not exist.

An example is the TowersOfHanoi app that Microsoft ships as example. This does not have a page extension to execute itself.

Works all the time.

Want to learn more about extensions? Contact me today!

Tip #56 | Fix Error : Sorting cannot be done based on the XX field(s)

Today I’ve spent some time in NAV2016 figuring out this error message:


As you know in NAV2016 you can sort on each column even if there is no key and even if it’s a flowfield. So why am I getting this error?

In my case the Test field is a Flowfield of the type COUNT to another table. This should work fine, so why doesn’t it work here.

Reason is that the SQL Data Type is Integer instead of VarChar. A very old trick to make a SQL Database sort a Code field just like the Native database.

The SQL Data Type in the “Other” table does not match this SQL Type hence the sorting fails.

Since I could not find any info online on this message I thought it was worth sharng.


Tip #54 | PowerShell Merge – A clustered key can appear only once in a table

If you upgrade your database to NAV2016 using the PowerShell Merge commandlets and have a change to table 49 you will run into this issue.

Table 49 is the Invoice Posting Buffer table that NAV uses to create G/L entries for each unique combination of values in the Sales and Purchase documents. With the NAV2016 release Microsoft have added the Deferral Code field to this table and the primary key.
Continue reading “Tip #54 | PowerShell Merge – A clustered key can appear only once in a table”

Tip #53 – Locks, Blocks, Deadlocks and Timeouts | What are they

Recently I’ve been asked to do a code review of a vertical solution. Since these are always interesting projects I cleared my schedule and planned an interview to see what it was about. I’m curious by nature.

During the interview I was told that some of their customers were complaining about deadlocks. This was going on for a while now and they did their best to look at the problem and even created a chart with deadlocks per day.

This was honestly not that much so I figured something else must be wrong. After the intake we spent some time looking at one customers system and I started up some measurements in SQL Server Profiler. Nothing fancy, just some lock events.


This showed that not deadlocks, but locktimeouts are causing the problem. From a user perspective they almost look the same.

Here is the deadlock message:


And the locked message:


But the source of the problem can be entirely different.

Simulate a (b)lock timeout

This is realatively easy. Simply create one codeunit that reads a customer record and hold the transaction with a confirm. (Never do this in real life kids)

Lock Code

Now simply run this codeunit twice and the timeout message will appear.

Simulate a deadlock

This is a little harder. We need two codeunits this time.

deadlock code

In this scenario we read two different customer records with a confirm in between.

Start both codeunits and then quickly press the confirm message. If you do this within the locktimeout window (default 10 seconds) you will get a deadlock.


This last example also proves the myth about locktable busted. This is probably the most ambiguous command in C/AL language. It does not what it implies. It does NOT lock the table, but only locks the specific rows you read in the database.

Microsoft, can you please rename this to something that makes more sense?


You can also measure blocks and deadlocks using the tools Jorg Stryk provides for free. http://dynamicsuser.net/blogs/stryk/archive/2014/10/10/directions-emea-2014-troubleshooting-nav-2013-r2.aspx

Tip #52 – Run MODAL pages after INSERT

One of the things I spend a lot of time on during my workshop is design for performance and using temporary tables. There are so many great things you can do here.

Let’s look at this code:

Buffer 1

Typically after an insert you would expect this error when trying a RUNMODAL

Buffer 2

But, not in this case. Here we have this:

Buffer 3

The reason why this works is the use of a temporary table. The record is not actually inserted into the SQL Server database.

Buffer 4

This is very useful for example when running a wizard. This allows you to roll back the transaction very easily when the wizard was cancelled.

Do you want to lean more?

During my workshop I spend a lot of time on these typical things in NAV that are poorly documented but very powerful.

The next workshop is in Copenhagen, close to the heart of NAV developement.

Register here. (QBS Partners can use vouchers)

Tip #51 – Scrolling Development Environment in Windows 10

If you install Windows 10 RTM and Dynamics NAV 2015 development environment you will notice that the scrolling on the development environment with your mouse wheel does not work.

Scrolling in Windows 10-1

I was pointed to this by the NAV Yammer group and found it hard to believe since I’ve been testing with Windows 10 for a while.

This is a bug and will be fixed by Microsoft.

Fortunately Mibuso has the answer.


It seems to be a setting in Windows 10

Go To: Settings – Device – Mouse & Touchpad – Turn Off “Scroll inactive windows when I hover over them”

Scrolling in Windows 10

Thanks massicm!

Tip #50 – Implementing Addresses

Many, many years ago, in 2009 I’ve written a blog about how to implement No. Series in Microsoft Dynamics NAV. This is one of the oldest features in the product, first introduced in Navision Financials 1.1. When I acquired the product as an end user this was presented as a new feature.

Implementing features like this in your add-on products will make your software recognisable as NAV software and make it easier to use the product for customers.

Another example of a typical way of doing things in NAV is using addresses and formatting them to be printed. This is maybe older than Number Series.

So, since we are doing tip number fifty since I started the first one in 2009 lets focus on that feature and how to implement an address in NAV in such a way that people who are familiar with NAV will recognise it as NAV.

This does not mean that how we work with addresses in NAV cannot be improved, but this is the typical way to implement it in the product.


This creates a standard address format, listing all necessary fields, attributes and methods to generate a basic version of the data entity.

It is being used for master data of the category Business and Document entities.
Examples of usages are:

Business Master Data:

  • Table 18: Customer
  • Table 23: Vendor
  • Table 270: Bank Account
  • Table 5050: Contact


  • Table 36: Sales Header
  • Table 38: Purchase Header
  • Table 5900: Service Header
  • Table 5740: Transfer Header

When implemented, addresses have a standard set of fields
Address – Text 50
Address 2 – Text 50
City – Text 50 (Tablerelation: Post Code)
Contact – Text 50
Country/Region Code – Code 10 (Tablerelation: Country/Region)
Post Code – Code 20 (Tablerelation: Post Code)
County – Text 30

The Post Code field and City Code field have the following C/AL Code.

Post Code
PostCode.ValidatePostCode(City,"Post Code",County,"Country/Region Code",(CurrFieldNo <> 0) AND GUIALLOWED);
PostCode.ValidateCity(City,"Post Code",County,"Country/Region Code",(CurrFieldNo <> 0) AND GUIALLOWED);

PostCode is a global variable of type record, table Post Code.

Naming & Conventions

Master Data :

  • Standard Field Names

Documents :

  • If multiple addresses exist then : How Used + Field Names
    Example: Bill-to Address
  • If only one address exist then : Standard Field Names


When implemented on documents, data is inherited when the reference to the master data is populated.

"Bill-to Address" := Cust.Address;
"Bill-to Address 2" := Cust."Address 2";
"Bill-to City" := Cust.City;
"Bill-to Post Code" := Cust."Post Code";
"Bill-to County" := Cust.County;
"Bill-to Country/Region Code" := Cust."Country/Region Code";

Users can change the values after they are inherited. When the master data is changed, the documents are not updated.


The standard way of printing addresses on documents is done using an API, Codeunit 365. For each reference of the address this API has a function that takes the record as a parameter and returns an array of type Text, length 80 with 8 dimensions.
The formatting is done based on a set of business rules in the application that is out of the scope of the blog post.


A document table has a reference to the Customer Master Data and inherits the Address Fields

The table contains a reference to the customer table using a field like

Customer No. Code 20

"Address" := Cust.Address;
"Address 2" := Cust."Address 2";
"City" := Cust.City;
"Post Code" := Cust."Post Code";
"County" := Cust.County;
"Country/Region Code" := Cust."Country/Region Code";

When populated the address fields get copied over from the master data. The address fields reference to the customer table.

Address – Text 50
Address 2 – Text 50
City – Text 50
Contact – Text 50
Country/Region Code – Code 10
Post Code – Code 20
County – Text 30

To format the address fields, a function in the API (Codeunit 365) exists

ExampleDocument(VAR AddrArray : ARRAY [8] OF Text[50];VAR ExampleDocument : Record "Example Document Header")
WITH ExampleDocument DO
    AddrArray,"Ex-Name","Ex-Name 2",'',"Ex-Address","Ex-Address 2",
    "Ex-City","Ex-Post Code","Ex-County","Ex-Country/Region Code");

Specific Example

Addresses are used in Sales Documents like shown in this screenshot
Address Format 1Address Format 2The Values are inherited using C/AL Code
Address Format 3The code for post code and city is validated
Address Format 4We can print the address using functions in the API
Address Format 5On a report this code populates the array to be printed on the report.
Address Format 6


You can see this used in the following tables & pages:

Master Data: Company Information, Location, Customer, Vendor, Bank Account, Resource, Contact, Employee, Union, Responsibility Center, Work Center, Machine Center.

Other Tables: Customer Bank Account, Vendor Bank Account, Ship-to Address, Order Address, Contact Alt. Address, Alternative Address, Service Item
Processes Job

Documents: Sales Header, Purchase Header, Sales Shipment Header, Sales Invoice Header, Sales Cr.Memo Header, Purch. Rcpt. Header, Purch. Inv. Header, Purch. Cr. Memo Hdr., IC Outbox Sales Header, IC Outbox Purchase Header, Handled IC Outbox Sales Header, Handled IC Outbox Purch. Hdr, IC Inbox Sales Header, IC Inbox Purchase Header, Handled IC Inbox Sales Header, Handled IC Inbox Purch. Header, Reminder Header, Issued Reminder Header, Finance Charge Memo Header, Issued Fin. Charge Memo Header, Service Header, Service Shipment Header, Service Invoice Header, Service Cr.Memo Header, Sales Header Archive, Purchase Header Archive, Transfer Header, Transfer Shipment Header, Transfer Receipt Header, Service Contract Header, Filed Service Contract Header, Return Shipment Header, Return Receipt Header


Adding an address reference adds 500 characters (Double Byte) to the table. Each table can only have 8000 characters.

Other applications when using interfaces might use different formatting. Using three address fields is very popular.

This might lead to conflicts in Dynamics NAV

On Master Data, when addresses are implemented often the following fields also exist, although they are not part of the address

Phone No. Text 30
Fax No. Text 30
E-Mail Text 80
Home Page Text 90


Elements that are typically used in connection with the Address elements could be the “No. Series”, “Master Data” and/or the “Documents”. Master Data are central to almost everything we do, so most elements connect in one way or another to the Master Data.