Replace assumption of 100% if only one sector published with rule

Currently the guidance is that “f the activity has only one sector, then it is presumed that 100% of the funding is going to that sector”.

This (as with all of the ‘assumption’ based rules) makes it harder for data users. The ‘assumption’ of 100% could be replaced by a rule that requires a percentage value to be given for all sectors added, and therefore that this should be 100% where only one sector is provided.