Hi @Zolotoy
What do you mean by "order doesn't work"? Does it mean that the data has not changed at all?
I did a simple test and made a report to group by the first column. I sort number in the Tablix data area and in the details group separately and they show the same result, both sort "Number" within the group.
I also tried adding interactive sort and it works fine too. Are there any problems with your operation?
Are there any problems with your operation? Maybe you can refer to these links to understand the steps of sorting.
Interactive sort in a paginated report
Best regards,
Aniya