Selecting Current Module In Processing Options
You can force the download of all child records associated to the current module by selecting the current module in the processing options box.
This ensures that if there is an update to a record, all children are reloaded to a user's device, even if the user had previously removed them from a device.
Normally, only the updated record is passed, but this ensures that a complete set of data is resent whenever a record is updated.
If a contact has phone calls associated to it (as a child), a user could have removed previous calls on their device. If in the getupdate rules for Contact, the administrator has selected Contact in the processing options box, whenever there is an update to a contact record, all child records would be redelivered. It forces a reload to ensure that the user has a complete set of related objects.