NAV 2017 Events - A Real World Example

February 17, 2017 Greg Williams

With Microsoft Dynamics NAV 2017, you can use events to design the application to react to specific actions or behavior that occur, enabling you to separate customized functionality from the application business logic. Using events where customizations are usually made provides a lower cost of code modifications.

The principal is that you program events in the application to run customized behavior when they occur. In this example, we are going to develop the same customization to NAV – with and without the use of Events subscriptions. The business requirement is to check to see if sales order margin is more than 20% at the time of posting.

Modifying NAV in Version 2015 and earlier

To address this requirement in older versions of NAV, a NAV developer would insert custom code into codeunit 80 to execute additional business logic (for example check if order margin is above 20%).  The end result was that the business user was satisfied – until they had to pay to have a developer merge that code into the next version of NAV.   

DNAV Development Environment Database Screenshot

Modifying NAV in 2017

In NAV 2017, a developer would address the same business requirement without modifying codeunit 80.  In the example below, you will see that Microsoft has introduced events to NAV.  The event, in this case, is OnBeforePostSalesDoc.  A NAV developer would write a custom codeunit in the customer range (50000 -99999) and then subscribe to the event in CodeUnit 80.  While NAV is executing codeunit 80, that event will check the custom codeunit and execute the business logic (in this case check for 20% margin). 

 

DNAV Development Environment Event Screenshot

 

DNAV Development Environment Event Subscriber ScreenshotSummary

The difference between these two approaches is not evident to the business user.  However, the new approach eliminates the need to merge code in CodeUnit 80 when moving from version 2017 to a later version.  The upgrade effort will be much faster, as standard NAV code is left unmodified. 

 

 

 

About the Author

Greg Williams

As Western Computer's Dynamics Practice Manager, Greg Williams is responsible for aligning the company's product and service offerings with the specific needs of its customers. Greg's 15 years of experience with ERP implementations in the manufacturing and distribution industries allows him to identify potential risks and immediately mitigate them with creative solutions.

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