No Sale opens the cash drawer without ringing a transaction, for making change or dropping cash.
The POS performs a No Sale only when both are true:
Every No Sale is recorded against the staff member who performed it. Sites with cash shrinkage should review No Sale counts by person before assuming a POS fault. Leaving the permission on for every job type removes the one signal that would show the problem.
Source: Global Payments Genius POS User Guide. Newly built article, pending review.