I have a table with 3 fields

ID (PK)
MDCMainId int
PacketId int

boPacketLists is the name of the bizobj class.
RetrieveAutoIncrementPK is set to true

I have a method of a bizobj that adds a series of rows to the table
using NewRow, and then setting the values

boPacketLists oPL = new boPacketLists();

foreach(DataRow oRow in this.GetCurrentDataSet().Tables[0].Rows)
{
	oPL.NewRow();
	oPL.DataRow["MDCMainId"] = oRow["id"];
	oPL.DataRow["PacketId"] = iPacketId;				
}

oPL.SaveDataSet();

The rows are all added successfully to the dataset, but when SaveDataSet is called, it using the same value for ID, and therefore the following error is generated

Column 'ID' is constrained to be unique. Value '36' is already present.

Any ideas??

Thanks,
Rick