Assisted Ms. Jen Accad on the issue she encountered again on NAV while posting. " Unable to post because the table is being used or locked by another user." I advised them first to close the NAV if not in used and then try restarting their PC but the same problem occurs. So we scheduled the restarting of services of NAV during the lunch time so the logs on nav can be refreshed then advised them again to restart all their pcs. This is now okay.