For the purposes of point (a) of Article 56, institutions shall calculate holdings of own Additional Tier 1 instruments on the basis of gross long positions subject to the following exceptions:
(a) institutions may calculate the amount of holdings of own Additional Tier 1 instruments on the basis of the net long position provided that both the following conditions are met:
(i) the long and short positions are in the same underlying exposure and the short positions involve no counterparty risk;
(ii) either both the long and the short positions are held in the trading book or both are held in the non-trading book;
(b) institutions shall determine the amount to be deducted for direct, indirect or synthetic holdings of index securities by calculating the underlying exposure to own Additional Tier 1 instruments in those indices;
(c) institutions may net gross long positions in own Additional Tier 1 instruments resulting from holdings of index securities against short positions in own Additi
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