M2E Pro detects the changes made to your settings and Magento Products. It checks whether these modifications meet your Synchronization Rules and if so, schedules the appropriate action for the Item. This approach allows synchronizing your Magento data with the Channels.
For the most efficient processing, the scheduled Product changes are ranked based on their importance. This way, urgent actions like Stop or Revise have higher priority.
Actions with lower priority, such as List or Relist, are processed after the actions of a higher priority get completed.
Once the Sync Rules are met, the Product gets marked with the Action is Scheduled label. In the Listing grid, you can view actions that are already scheduled for your Items. This will help you to be aware of any inventory updates.
After the scheduled action is taken into processing, its label is changed to Action in Progress.