EBU Single Rulebook Q&A 16 October 2015 2015_2416 C103.999 - Exposure

Is it necessary to populate the "Exposure" field 103.999 in template C103? In the Data Point Model for C103.00, there is reference to a 103.999 "Exposure" field (cells C7 & D7 in the file attached). However, there is no reference to this in either Annex III or Annex IV. Credit institution In template C 103.