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How to remove validations on city field on customer card in business central

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Posted on by Test user

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Hi Guys,

In our default functionality,when we select city then post code is autopopulated on customer card.

I want to remove this functionality/validation.

output :post code sholud be empty when i enter on city.

Is any way to do this.

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Dynamics 365 Business Central

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Holly Huffman 6,554 Super User 2026 Season 1 on at

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Good morning, afternoon, or evening depending on your location!

To remove the validation that automatically populates the Post Code field when the City field is entered on the Customer Card in Business Central, you can modify the behavior using AL code. Here's how you can achieve this:

Steps to Remove Validation

Create a Table Extension:

Extend the Customer table to override the default behavior of the City field.

Remove or modify the OnValidate trigger for the City field.
Example AL Code:
tableextension 50100 CustomerExtension extends Customer
{
    fields
    {
        field(50101; City; Text[50])
        {
            trigger OnValidate()
            begin
                // Do nothing to prevent Post Code from being auto-populated
            end;
        }
    }
}

Customize the Page:

Extend the Customer Card page to ensure the modified behavior is reflected in the UI.
Example AL Code:
pageextension 50101 CustomerCardExtension extends "Customer Card"
{
    layout
    {
        addlast(Group)
        {
            field(City; Rec.City)
            {
                ApplicationArea = All;
            }
        }
    }
}

Test the Changes:

Deploy the extension and test the City field on the Customer Card.

Verify that entering a value in the City field no longer auto-populates the Post Code field.

Alternative Approach
If you want to retain the default functionality but allow manual entry in the Post Code field:

Use a custom field for the Post Code and map it to the original field only when needed.

This ensures the default validation logic does not interfere with manual input.

Hope this helps some!

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Tech-Lucky 1,288 Moderator on at

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You can do this easily by creating an event subscriber for the OnAfterValidate trigger of the City field, and then setting the Post Code field to blank within that subscriber.

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KasparsSemjonovs 4,849 Super User 2026 Season 1 on at

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This can be achieved only with some development.

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Jainam M. Kothari 17,045 Super User 2026 Season 1 on at

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Hello,

It requires Customization for the same.

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Khushbu Rajvi. 23,136 Super User 2026 Season 1 on at

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You would need to modify the logic that triggers the population of the postcode.

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Gerardo Rentería Ga... 27,611 Super User 2026 Season 1 on at

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Hi, good day
I hope this can help you, and give you some hints.

Custom Address formats in Countries/Regions

Custom Address Formatting - FORNAV

Best Regards
Gerardo

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