Ability to work with orders during DoCheque operations in ICashRegister

The V9Preview1 API now allows you to work with orders during the DoCheque operation using IOperationService.

To change any order data, for example, to add external data using AddOrderExternalData, you must use IOperationService, which is an input argument DoCheque.

Since the order is already in status Bill during the execution of DoCheque, most operations are unavailable.