Clear service overbooking limits

Deletes service overbooking limits that exactly match the specified conditions. This operation is intended to be used alongside serviceOverbookingLimits/set. The specified conditions must be met exactly. The time interval, however, does not need to correspond to an existing service overbooking limit in the system, instead the API uses a splicing algorithm to work out how to divide up any existing service overbooking limit to meet the specified time interval. Past overbooking limits cannot be cleared outside of OperationalEditableHistoryInterval. Care is needed to specify FirstTimeUnitStartUtc and LastTimeUnitStartUtc in the correct format - see Datetimes. This operation supports Portfolio Access Tokens.