AddOrder Instruction should create unique Order IDs when used in Fork/ForkList branches

Current Situation

• The AddOrder instruction creates new Order IDs based on the parent Order ID.
• However, if more than one AddOrder instruction is used in a workflow with a similar position, e.g. in the first position, then no unique Order IDs are created.

Desired Behavior

• Uniqueness of Order IDs created from AddOrder instructions has to be improved. To this purpose the Branch ID is added to the new Order ID.