In Cetec ERP, orders derive their numbering from the quote from which they are created. For instance, if two orders are created from the quote 900, the first order created is named 900.1, and the second, 900.2. After that, each line in an order is given a line number e.g. 900.1-1 and 900.1-2, 900.2-1, 900.2-2 and so forth.

Meanwhile, invoices also get their numbering from the orders from which they are created e.g. 900.1-1 and 900.1-2. So while the line numbers and the invoices use the same naming scheme, they refer to two different objects which can be differentiated by their context.

Example: Order 900.1 containing 5 line items work order 900.1-1 work order 900.1-2 work order 900.1-3 work order 900.1-4 work order 900.1-5

If you ship work 900.1-3 first, that would create an invoice labeled 900.1-1.