Copy related entities

Hi I have some entities e.g Customers, OrderHeads, Orderlines
Customers
CustomerId
Name
VersionNo

OrderHeads
OrderId
CustomerId
Date

OrderLines
OrderLineId
OrderNo
ProductId
Qty

All the pk ids are identities.
I want to "version" a customer i.e take a copy of the customers data and all related data.

I am trying something similare to this.
 currentCustomer = Context.Customers.Include("OrderHeads").Include("OrderHeads.OrderLines")
                   .Where(c => c.CustomerId == 5).SingleOrDefault();

Customers newCust = currentCustomer ;
 
db.Project.Add(newProject);
db.SaveChanges();

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This does copy the customer and the newCustomer has a new Id in the table. But then I get an error.

The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: A referential integrity constraint violation occurred: The property values that define the referential constraints are not consistent between principal and dependent objects in the relationship.\r\n   at System.Data.Objects.ObjectContext.SaveChanges


It has copied the customer but not the Orders.
Is what I am trying to do possible and if so how. (I would rather not have to loop through each child changing the customerId)

i tried it with these to classes also but got the same error

 public class Test
    {
        
        public virtual ICollection<TestChild> TestChild { get; set; }
        public int TestId { get; set; }

        public int tno { get; set; }
       
            }

    public class TestChild
    {
        
        public virtual Test test { get; set; }
        
        //FK
        public int TestId { get; set; }


        public int TestChildId { get; set; }
        public int childno { get; set; }
    }

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                   var test = db.Test.Include("TestChild")
                   .Where(p => p.TestId == 2).SingleOrDefault();
                    if (test != null)
                    {

                        Test newTest = test;
                        //newProject.VersionNo += 1;

                        db.Test.Add(newTest);
                        db.SaveChanges();

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LVL 1
EamonAsked:
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Jim P.Connect With a Mentor Commented:
Dumb thought -- but would a stored procedure work better and then returning the results to the C# interface?
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EamonAuthor Commented:
Originally I had a SP for versioning but am trying to do everything in entity framework code first. Also with the SP if you change the table e.g. add a new field you have to update the SP.
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apeterCommented:
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