Hi Alberto,
If your also facing this issue with your ID then you can ask your security team to enable trace for this query and then try to execute it in RSRT to see if this is an authorization issue.
Also if your using queries using BIA/BWA then execute the report in RSRT with debug mode where you disable the cache and BIA indexes. We had encountered a smilar issue where the indexes were corrupt which caused authorization issue
Thanks
Abhishek Shanbhogue