Assign a value from Gen Business Posting Group Table.

I have got Gen Bus. Posting Group field showing on the subform of Sales Order. This Subform is also showing Location Code for the Line.

I am attempting to write a logic as such that if the User selects Location Code as DROPSHIP, the Gen Bus. Posting Group should be LOCAL-DROPSHIP.

LOCAL-DROPSHIP is a record in the Gen. Bus. Posting Group. I have created it before writing this code. However, it would not assign to my rec.Gen Bus. Posting Group.

Here is the code on the Subform;

modify("Location Code")
        {
            trigger OnAfterValidate()
            var
                recLocation: Record Location;
                recCustomer: Record Customer;
                recSalesLine: Record "Sales Line";
                recGenPosting: Record "Gen. Business Posting Group";

            begin
                recGenPosting.Get('LOCAL-DS');
                if rec."Location Code" = 'DROPSHIP' then begin
                    Message(recGenPosting.Code);
                   // Validate("Gen. Bus. Posting Group", recGenPosting.Code);
                    Rec."Gen. Bus. Posting Group" := recGenPosting.Code;
                    CurrPage.Update();
                end;
            end;
        }