"Lifespan SBEM checks whether a horizontal envelope is a floor, ceiling or roof by checking it's name from left to right. Where it has /f or /floor this a floor, /c or /ceiling a ceiling etc. Usually this is input by Lifespan SBEM when using the envelopes or quick envelopes functions and there is no issue, however if the user places a /f or /c in their envelope name this may cause a problem. e.g. 00/01 First floor W/C/floor This will be read by Lifespan SBEM as a ceiling due to the appearing before the . Thus an error will be reported stating that there is no floor. The safe solution is for any / to be removed from the text that the user enters. I am waiting for Steve to do this programmatically"