No harm done
LLTCWX is the name of the Regulation applied by Brussels CFMU associated with a Traffic Volume or Airfield. It will normally then have the day of the month appended e.g. LLTCWX01. If it is amended then a letter is added e.g. LLTCWX01A.
This allows everyone to be able to refer to the correct Regulation specifically when making queries or changes.