Links to OrderItemId in ChequeSale

The property OrderItemIds has been added to the class ChequeSale.

The property contains a list of order item identifiers associated with the cheque line. It can contain multiple elements if several lines in the order are combined into one line in the cheque. It remains empty for cheques not linked to orders, as well as for advance cheques.

public class ChequeSale
{
    /// <summary>
    /// List of order item identifiers.
    /// Can contain multiple elements if several lines in the order are combined into one line in the cheque.
    /// Remains empty for cheques not linked to orders, as well as for advance cheques.
    /// </summary>
    List<Guid> OrderItemIds { get; }
}