Updated the table class files to allow a nullable ad special ID and changed the enum in the new modify record form to a boolean. Added a form to manage ad special keywords, still needs to handle removing them properly.

AdvertsingProfitControl/Invoice.cs

@@ -13,7 +13,9 @@ namespace AdvertsingProfitControl
         [Column(TypeName = "date")]
         public DateTime InvoiceDate { get; set; }
 
-        public int InvoiceNumber { get; set; }
+        [Required]
+        [StringLength(256)]
+        public string InvoiceNumber { get; set; }
 
         public decimal? InvoiceNetAmountAtCost { get; set; }
 
@@ -27,7 +29,7 @@ namespace AdvertsingProfitControl
         public int FkDateId { get; set; }
 
         public virtual WeekEndingDate WeekEndingDate { get; set; }
-        [Required]
+
         public virtual Supplier Supplier { get; set; }
     }
 }