Hi,
after migrating the queries form 3.x to 7.x fallow the below steps.
1. run the all reports in RSRT and BEx analyzer, portal.
2. check the all queries all migrated are not.
3. new selections, new formulas
3.Customer exit variable
4.Virtual Characteristics/Key figures.
5.Text variables with replacement path.
6.Check for Formula variables.
7.Run time Unit and/or Currency conversions.
8.Hierarchy variables or Hierarchy.
9.Query execution using RRMX (IN BEX)
10.Creation of a work Book and refresh the work book.
11.All existing functionalists of work like copy sheet,Global and local variables
12.Excel version of queries.
13.Broadcasting a workbook and query
14.customer exit variables and formula variables.
15.BEX broad cost settings.
Thanks,
Phani.