I just want to make sure that I understand this correctly.

A written warning issued outside of an inquiry can be valid up to 6 months, after which it lapses.

As the result of an inquiry, this period may be extended to 12 months, which is the maximum.

Therefore, after every 12 months, the disciplinary procedure reset and you must start all over? Like an employee stay away from work after annual leave, for extended period, then come back to work with some poorly explained reason. If the employee have a FWW on file, older than 12 months, it can not be taken into account?

Can those FWW's and WW's be held on file to show habit?