The Previous task field determines which task/s must be completed for a current task to be indicated as ready.
The resource assigned to the task can only start working on his task when it’s indicated as ready meaning Previous task/s completed because only then, all required assets and OOONA tool (in integrated systems), to complete the task will be available for the resource within the order.
The default Previous task is “Flow” meaning that only the actual previous task must be completed for the task to be indicated as ready.
The default “Flow” can be changed by selecting in the “Previous task” field any other task/s that is positioned before the current task in the order’s workflow.
for example,
for the following “Final QC” task to be indicated as ready for the assigned resource, both QC and Final Proxy received tasks must be completed