/// <summary>
/// Add a <c>Contract Detail</c> to <c>Contract</c> with required data.
/// </summary>
/// <param name="contractId"><c>Contract</c> Id</param>
/// <param name="customerType"><see cref="CustomerType"/></param>
/// <param name="customerId">Customer Id</param>
/// <param name="title">Title (description) of contract line</param>
/// <param name="startDate">Start date</param>
/// <param name="endDate">End date</param>
/// <param name="totalPrice">Total price</param>
/// <param name="totalAllotments">Total number of <c>minutes</c> or <c>case (incident)</c> allowed for the contract line.</param>
/// <returns>
/// Created record Id (<see cref="System.Guid"/>)
/// </returns>
public Guid Add(Guid contractId, CustomerType customerType, Guid customerId, string title, DateTime startDate, DateTime endDate, decimal totalPrice, int totalAllotments)
{
ExceptionThrow.IfGuidEmpty(contractId, "contractId");
ExceptionThrow.IfGuidEmpty(customerId, "customerId");
ExceptionThrow.IfNullOrEmpty(title, "title");
ExceptionThrow.IfEquals(startDate, "startdate", DateTime.MinValue);
ExceptionThrow.IfEquals(endDate, "endDate", DateTime.MinValue);
Entity entity = new Entity(this.EntityName);
entity["contractid"] = new EntityReference("contract", contractId);
entity["title"] = title;
entity["customerid"] = new EntityReference(customerType.Description(), customerId);
entity["activeon"] = startDate;
entity["expireson"] = endDate;
entity["price"] = new Money(totalPrice);
entity["totalallotments"] = totalAllotments;
return(this.OrganizationService.Create(entity));
}