sir i deveop software in c# , sql server since 2005. currenty i have more than 200 customers using my account/inventory software.
in my software,end user can custmise the entry modules, set taxation formulas.
In reoport, End user can add new field, Remove fields,Save single report in various style ( customerwise/product wise)
i.e user can create new report from existing one.
End user can create invoice print.