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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Updating a FlowField a...
Small and medium business | Business Central, N...
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Updating a FlowField after related field is modified

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I've created a custom table with 2 fields - One is a lookup to the Customers table, the other is a FlowField that displays the name of the customer selected in first field.

        field(18; Customer; Code[20])
        {
            DataClassification = ToBeClassified;
            Caption = 'Customer No.';
            TableRelation = Customer."No.";
        }
        field(19; CustomerName; Text[250])
        {
            Caption = 'Customer';
            FieldClass = FlowField;
            CalcFormula = lookup(Customer.Name where("No." = field(Customer)));
        }

Both fields work correctly, however I'm noticing that if I change the Customer No selected in the first field, the second field doesn't display an updated name until I close and reopen the record.

My question is how can I update the Customer Name field every time the Customer No. is changed, without having to reopen the page? I'm assuming I should utilize the OnModify function but can't quite figure it out.

Thanks!

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  • Verified answer
    YUN ZHU Profile Picture
    YUN ZHU 97,288 Super User 2026 Season 1 on at

    Hi, please don't use flowfield, try the following code.

            field(50100; Customer; Code[20])
        {
            DataClassification = CustomerContent;
            Caption = 'Customer No.';
            TableRelation = Customer."No.";

            trigger OnValidate()
            var
                Cust: Record Customer;
            begin
                if Cust.Get(Customer) then
                    CustomerName := Cust.Name;
            end;
        }
        field(50101; CustomerName; Text[250])
        {
            DataClassification = CustomerContent;
            Caption = 'Customer';
            Editable = false;
        }

    pastedimage1643328385034v1.png

    Hope this will help.

    Thanks.

    ZHU

  • Community Member Profile Picture
    Community Member on at

    I have found my issue: I reused the 'Job' object. I have changed this value and everything works well.

    Zhu - you continue to come to my rescue, thank you!

    Your suggestion fixed this problem, however I am trying to use the same logic for a similar issue and it does not work.

    I have created a field on the Job card.

    tableextension 50103 AddJobFields extends Job
{
    fields
    {
        field(50103; AddressStreet; Text[250])
        {
            DataClassification = ToBeClassified;
            Caption = 'Street';
        }
    }
}

    In my new table, I have added 2 fields. The first is a lookup to Jobs, and the second is a textbox that should display the related Jobs 'AddressStreet' field that I created above.

            field(2; Job; Code[20])
        {
            DataClassification = CustomerContent;
            Caption = 'Job';
            TableRelation = Job."No.";

            trigger OnValidate()
            var
                Job: Record Job;
            begin
                if Job.Get(Job) then
                    AddressStreet := Job.AddressStreet;
            end;
        } 
        
        field(3; AddressStreet; Text[250])
        {
            DataClassification = CustomerContent;
            Caption = 'Street';
            Editable = false;
        }

    I would expect this work, however when I set a value in the Job field, I get the error

    Validation Results

    The length of the string is 224, but it must be less than or equal to 20 characters. Value: Open Never {00000000-0000-0000-0000-000000000000} Fixed FCY Fixed FCY No No No Per Job No {00000000-0000-0000-0000-000000000000} No 0 0 0 0 No 0 0 0 0 0.

    Why would this be happening?

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