最近公司要投资BlackRock的一个 STREAM portfolio securities，其中BL公司的产品介绍上写着：“STREAM aims to have a stable allocation to the Alpha Fund over its life. As such, coupon payments should not lead to a VAR budget of less than 5%, as this is the estimated minimum VAR budget to be fully invested in the Alpha Fund. 是什么意思啊？主要是“coupon payments should not lead to a VAR budget of less than 5%".  谢谢啦