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A record is identified in a unique way by means of the following attributes: T_AUDIENCE_SUB_CAT_ID, T_ITEM_ID, T_SALES_CHANNEL_ID, T_PROMOTION_ID,, T_TIMESLOT_ID, VISITGROUP_ID. The attributes T_PROMOTION_ID,, T_TIMESLOT_ID, VISITGROUP_ID can be null.
In case of a performance or a match, T_ITEM_ID can be replaced by the couple (T_PERFORMANCE_ID, T_SEAT_CAT_ID).
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