Meaning of "sweet and sour" in a project or corporate financing agreement?

The term looks to cover the risk bearing of the lending banks in a project or coroporate financing agreement.
Answer
This concept has been invented to describe the investment climate in china today for an excellent discussion of this concept, see this article: "sweet and sour the trade-off between risk and reward cannot get much bigger than in china, as these companies found. " http://www.cfo.com/article.cfm/2988452/c_2984287/?f=archives