the first case might arise when an affiliated company agrees to be become the primary obligor for the debt. the second case might arise for several reasons. first, a debtor may be in a refunding situation where it has issued new debt and received the proceeds,but is waiting for more favorable market conditions to retire the old debt. second,the debtor may desire to recall certain debt and has the has cash available to do so,but the recall date has not been reached. third, the debtor may have sufficient cash available to retire the debt,but the recall price is too high.