It is an unfortunate oversight in our aircraft documentation system that there is generally no formal way to actually indicate on the structure of an aircraft itself that a defect (crack) has been detected, inspected, and is being "watched" within the scope of an approved means
We run an out of phase check sheet in the front of the release to service sheet which to be honest I am trying to get rid of (along with the SOAP sheet). Its another bit of paper that could potentially ground you if its not filled in. The compromise I have managed to negotiate with the head spanner is that it gets signed off for 20 days but is always signed off as part of the 10 day check for 20 days.