Closing files where cheques have been used/sent

I am trying move couple of matters from 'Open' to 'Closed' however SB is preventing this, stating that these matters have 'unpresented cheques'. These are the only two matters I have sent cheques to client for and I know they have banked the cheques. I am not sure what SB means when it says these are 'unpresented' and I am not sure what step I maybe should have taken earlier if there was something  else needed... is it a case of waiting until after I have done this month's reconciliation?