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Why is this an issue?

  Omitting the corresponding .dfm resource for a VCL form or frame is typically a
  programming error. While there are some cases that won't cause problems at runtime, it remains
  unintuitive and confusing.


  Additionally, a unit that doesn't contain a .dfm resource will lack design-time form
  editing functionality.


  This rule flags any TForm or TFrame descendant in a unit that doesn't
  include a .dfm resource.

How to fix it
Add a .dfm resource to the unit:
unit Foo;

interface

uses
  Vcl.Forms;

type
  TFoo = class(TForm)
    // ...
  end;

implementation

end.

unit Foo;

interface

uses
  Vcl.Forms;

type
  TFoo = class(TForm)
    // ...
  end;

implementation

{$R *.dfm}

end.