Client has both the company and period locked in Maintain -> Period Locking, but when going to Company -> Data Entry - Reported Values, is still able to make changes.
Resolving the problem
Go to Maintains/Period locking/Change multi period locking
The “Unlock all periods” is ticked. When this is selected, all periods, submissions and companies are opened. The checkbox overrules any settings in the Maintain/Period Locking/Change-Period Locking by company.
See also the User Guide under “Lock Periods”.