Entity Framework Error: Multiple added entities may have the same primary key in ASP.Net

Hello. I am create audit history of a record by clone the object, but when I called SaveChange, I got the error Unable to determine the principal end of the 'ISTS.Core.Context.FK_SYS_GROUP_USER_USER_ID' relationship. Multiple added entities may have the same primary key, here is my code

var auditRecord = new SYS_USER()
            {
                SYS_TRAN_ID = 1195358,
                AUDIT_FIELDS = null,
                AUDIT_OPERATION = "I",
                APPROVAL_STATUS = "I",
                UPD_SEQ = 0,
                AMND_STATE = "A",
                USER_ID = "phongbv",
                USER_NAME = "Bui Van Phong",
                DEPT_ID = 883,
                PASS_CODE = "CEEA23519F6F86AD67E9F798BF8002CB",
                STATUS = "A",
                EFFECTIVE = DateTime.Now,
                LAST_LOGIN = null,
                EXPIRY = null,
                TRY_COUNT = null,
                MAX_CONNECTIONS = null,
                USER_LEVEL = "9",
                LDAP_ID = null,
                AUTO_AUTHORIZED = 0,
                SID = 61726161,
                INHERIT_MENU_ACL = 1,
                USER_GROUPS = new List<SYS_GROUP_USER>()
                {
                    new SYS_GROUP_USER()
                    {
                        GROUP_ID = 224,
                        SID = 61726162,
                        AMND_STATE = "A",
                    }
                }
            };
            var finalRecord = new SYS_USER()
            {
                SYS_TRAN_ID = 1195358,
                AUDIT_FIELDS = null,
                AUDIT_OPERATION = "I",
                APPROVAL_STATUS = "I",
                UPD_SEQ = 0,
                AMND_STATE = "F",
                USER_ID = "phongbv",
                USER_NAME = "Bui Van Phong",
                DEPT_ID = 883,
                PASS_CODE = "CEEA23519F6F86AD67E9F798BF8002CB",
                STATUS = "A",
                EFFECTIVE = DateTime.Now,
                LAST_LOGIN = null,
                EXPIRY = null,
                TRY_COUNT = null,
                MAX_CONNECTIONS = null,
                USER_LEVEL = "9",
                LDAP_ID = null,
                AUTO_AUTHORIZED = 0,
                SID = 61726161,
                INHERIT_MENU_ACL = 1,
                USER_GROUPS = new List<SYS_GROUP_USER>()
                {
                    new SYS_GROUP_USER()
                    {
                        GROUP_ID = 224,
                        SID = 61726162,
                        AMND_STATE = "F",
                    }
                }
            };
            AppContext.TransactionContext.SYS_USER.Add(auditRecord);
            AppContext.TransactionContext.SYS_USER.Add(finalRecord);
            AppContext.TransactionContext.SaveChanges();