Поменял тип связи курса и рецепа, добавил поле recipeid в модель курса

Polyclinic/PolyclinicContracts/BindingModels/CourseBindingModel.cs

@@ -7,8 +7,8 @@ namespace PolyclinicContracts.BindingModels
         public int DaysCount { get; set; }
         public int PillsPerDay { get; set; }
         public string Comment { get; set; } = string.Empty;
+        public int RecipeId { get; set; }
         public Dictionary<int, IDiagnosisModel> CourseDiagnosis { get; set; } = new();
-        public Dictionary<int, IRecipeModel> CourseRecipes { get; set; } = new();
         public int Id { get; set; }
     }
 }

Polyclinic/PolyclinicContracts/ViewModels/CourseViewModel.cs

@@ -11,8 +11,8 @@ namespace PolyclinicContracts.ViewModels
         public int PillsPerDay { get; set; }
         [DisplayName("Комментарий")]
         public string Comment { get; set; } = string.Empty;
+        public int RecipeId { get; set; }
         public Dictionary<int, IDiagnosisModel> CourseDiagnosis { get; set; } = new();
-        public Dictionary<int, IRecipeModel> CourseRecipes { get; set; } = new();
         public int Id { get; set; }
     }
 }

Polyclinic/PolyclinicDataModels/Models/ICourseModel.cs

@@ -5,7 +5,7 @@
         int DaysCount { get; }
         int PillsPerDay { get; }
         string Comment { get; }
+        int RecipeId { get; }
         Dictionary<int, IDiagnosisModel> CourseDiagnosis { get; }
-        Dictionary<int, IRecipeModel> CourseRecipes { get; }
     }
 }