Let me describe the scenario.
My CRM system has a list of items that require an action to be taken on each item in the list. There are two workflows involved. Workflow A starts running when an item is added to the list. Workflow B runs as a child workflow for each item in the list.
I would like to arrange this so that Workflow A never has more than one instance of Workflow B running at any given time. Or put another way, I want to configure things so that Workflow A spawns an instance of Workflow B for the first item in the list, waits for Workflow B to complete, then moves on to the next item in the list and spawns an instance of Workflow B for that instance.
Is this possible, either OOB or with custom workflow activities / plugins?