Thanks guys - I guess it is one of those ‘undocumented features’!!
Solutions not really suitable - we have two levels in our P&L accounts with many begin & end totals breaking up our expenses into groups and we want to analyse these across dimensions using account schedules and some combinations of dimensions only touch a couple of the ‘groups’ of expense accounts but this is not a 100% rule so need to run report across all P&L accounts.
I will seek a fix for the ‘undocumented feature’!
Thanks for your help.