Once you launched a campaign, invites are being sent to all our prospects.
LinkedIn watches those open invites which have not been responded in any way.
At a certain point in time LinkedIn will limit the amount of actions you can do if you have too many open invitations.
Hence we enable you to just withdraw invitation a week after they have been handed.
Meaning one week after you send a prospect invitation request and he has not answered - we will delete that request.