Entity Framework Migration cascade delete is always true even WillCascadeOnDelete(false) in configuration

Question

Why relations with WillCascadeOnDelete(false) defined in configuration, are always true in generated migration?

Here is the configuration code

 public class PartySuppliesConfiguration:EntityTypeConfiguration<PartySupplies>
{
    public PartySuppliesConfiguration()
    {
        HasKey(x => x.Id);
        HasRequired(x=>x.Supplier).WithMany().HasForeignKey(x=>x.SupplierId).WillCascadeOnDelete(false);
        HasRequired(x => x.Product).WithMany().HasForeignKey(x => x.ProductId).WillCascadeOnDelete(false);
        HasRequired(x => x.Currency).WithMany().HasForeignKey(x => x.CurrencyId).WillCascadeOnDelete(false);
        HasRequired(x => x.CreatedUser).WithMany().HasForeignKey(x => x.CreatedUserId).WillCascadeOnDelete(false);
        Property(x => x.UnitPrice).HasColumnType("Money");
    }
}

and here is the generated migration

 public override void Up()
    {
        CreateTable(
            "PartySupplies",
            c => new
                {
                    Id = c.Int(nullable: false, identity: true),
                    SupplierId = c.Int(nullable: false),
                    ProductId = c.Int(nullable: false),
                    UnitPrice = c.Decimal(nullable: false, precision: 18, scale: 2),
                    CurrencyId = c.Int(nullable: false),
                    FromDate = c.DateTime(nullable: false),
                    ThruDate = c.DateTime(),
                    CreatedUserId = c.Int(nullable: false),
                })
            .PrimaryKey(t => t.Id)
            .ForeignKey("Parties", t => t.SupplierId, cascadeDelete: true)
            .ForeignKey("Products", t => t.ProductId, cascadeDelete: true)
            .ForeignKey("Curencies", t => t.CurrencyId, cascadeDelete: true)
            .ForeignKey("Users", t => t.CreatedUserId, cascadeDelete: true)
            .Index(t => t.SupplierId)
            .Index(t => t.ProductId)
            .Index(t => t.CurrencyId)
            .Index(t => t.CreatedUserId);

    }

Answer 1

It might be a silly question but have you overriden the OnModelBuilding method in DbContext and added modelBuilder.Configurations.Add( new PartySuppliesConfiguration( ) );? Does PartySuppliers have any DataAnnotations that might be overriding your entity config class? Or maybe it's derived from another class where cascadeondelete is set to true?