Hi Izabella,
Thanks for you explanation I understood what is happening but still some key points to understand how can we help (and if we can)
Perhaps, you are talking too much from the user perspective but we need more technical details. Despite I'm not an BI expert I'll do some more questions and with your answer another colegue can help.
Is this Bex Analyzer? Or Analysis for Microsoft Excel?
What changed despite the DB?
Is it a SAP BW that migrated to SAP BW on HANA?
The source you are querying is a custom one? Did your implementation remodeled to run with HANA information views?
Regards, Fernando Da Rós