In a report in Strategy where cross-tabbing is present, sorting may be desired in a descending order on the first column of the report:

However, after enabling sorting, the default behavior of Developer is to place the cross-tab nulls above non-null values, as shown in the screenshot above, which may not be desired. The following procedure describes how to enable settings which will place the cross-tab nulls below the non-null values in Strategy Developer.

For more information regarding the differences between cross tabulation nulls and warehouse nulls, refer to the following Strategy Knowledge Base documents:
KB14560: Cross tabulation nulls vs. warehouse nulls in MicroStrategy Developer 9.x
KB5391 - What is the difference between a Database Null and a Cross-Tab Null in Strategy Product Suite 9.x?