Hello experts,
I am facing a problem with Design Studio in that my applications gets an "Unknown error" message when exporting to Excel after I use the "undo previous step" on the Crosstab component.
Before I give more details on the error, here is some information on our environment:
* Design Studio version 16.2.1
* Design Studio BIP Add-on 1.6 SP 2 Patch Level 1
* My data sources are based on a relational Universe, which in turn is based on a MS SQL Server DB.
Here is the Crosstab:

I then change the layout by removing "Week" from the drilldown:

Next, I use the "undo previous step" option on the Crosstab. After the application has been refreshed and I am back to the initial layout on the Crosstab, I use the option to export the data to Excel. That gives me the following error:

If I do not use the "undo previous step", the export works fine.
Have you seen this problem before or would you be able to guide me resolving it?
Best regards,
Ronaldo