How to control a group of operators in process flow ?
Accepted solution
After the first batch of items is transported to Queue1, both operators will start to work at the same time. In your process flow, you tell them to always load the first item from the queue. This causes both operators to want to load the same item, meaning on operator will 'steal' it from the other, leaving them with only four items loaded. The process flow assumes that they will always load 5 items, so the last token in the unload usb flow causes an error, because there is no more item to unload on one of the operators.
To prevent this, you should tell the operators which items to load, so they don't interfere with each other. You can do this by assigning a reference to the item in the event triggered source and then aggregate those references into an array in the batch activity. Using the creation rank of the subflow tokens, each token holds information about which exact item should be loaded.
