I want to hide the field “Other Reason” if the field “Reason” has a value of “Other”

pageextension 50101 CJ_PurchaseReturnOrder extends “Purchase Return Order”
{
layout
{
addlast(General)
{
field(“TO Code”; Rec.”TO Code”)
{
ApplicationArea = all;
TableRelation = “Transfer Header”;
}
field(“Item Journal Code”; Rec.”Item Journal Code”)
{
ApplicationArea = all;
TableRelation = “Item Journal Line”;
}
field(“Reason”; Rec.Reason)
{
ApplicationArea = all;
}
field(“Other Reason”; Rec.”Other Reason”)
{
ApplicationArea = all;
}
}
}
}

I tried this:

pageextension 50101 CJ_PurchaseReturnOrder extends “Purchase Return Order”
{
layout
{
addlast(General)
{
field(“TO Code”; Rec.”TO Code”)
{
ApplicationArea = all;
TableRelation = “Transfer Header”;
}
field(“Item Journal Code”; Rec.”Item Journal Code”)
{
ApplicationArea = all;
TableRelation = “Item Journal Line”;
}
field(“Reason”; Rec.Reason)
{
ApplicationArea = all;
}
field(“Other Reason”; Rec.”Other Reason”)
{
ApplicationArea = all;
Enabled = EnableToCode;
}
}
}
var
EnableToCode: Boolean;

trigger OnAfterGetRecord()
begin
    if Rec.Reason = Rec.Reason::Other then
        EnableToCode := true
    else
        EnableToCode := false;
end;

}