My accountant friends working in company that use ax 2012, asking me
he trying to re-opening the periods, the problem was, he cannot check the “Delete close-of-year transactions during transfer” because it was disabled by forms (look the pic below)
the solutions is easy
general ledger -> setup -> general ledger parameter
goto ledger tab, scroll until this screen (look the pic below)
check the “delete close-of-year transactions during transfer” checkbox
and thats it