契約終了日が契約開始日より前の日を入力するとエラーを表示させる方法

契約終了日が契約開始日より前の日を入力するとエラーを表示させる方法

お世話になっております。
契約書の譲歩鵜をカスタムタブ出登録しています。
そこに日付項目「契約開始日」と「契約終了日」を設置しています。
契約終了日が契約開始日より前の日付を入力した場合にエラー表示が出て入力できないように設定したいと考えています。
入力規則やレイアウトルールを試してみましたが、上記2つの日付項目を比較する条件設定ができません。

また、入力規則には関数を利用することができますが、2つの項目を比較した条件設定はできないように見えます。

レイアウトルールや入力規則に限らず、契約終了日が契約開始日より前の日付を入力した場合にエラー表示が出て入力できないように設定する方法ご存じないでしょうか?

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