Cache not created for some queries

Hi,

We are finding that when the queries are run on BI 7.0 cache is not created for some queries but it does created for others.

Can anyone advise if there are certain scenarios when the cache would not be created ?

In my scenario e.g. for one query which is base on a multiprovider and having few formuales as well as a calculated key figure + a unit conversion for one key figure. Cache is not getting created for this query.

regards

Kulmohan