この問題は、Lightning Sync または Einstein Activity Capture (EAC) が原因である可能性が高いです 。
対象ユーザーのメールが複数の組織 (Sandbox を含む) に接続され、双方向で取引先責任者を同期している場合に発生します 。
同期先の組織に該当の取引先が存在しない場合、同期サイクル後に [取引先] 項目が削除されます。
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