It should be - are you referring to the override provided in "Report Settings"? If so, it should be working that way. If it's not, please log an issue with Customer Care and we'll look into it.
I am referring to the override in "Report Settings". The override works in Reports & Analytics but not on workspace reports. Workspace reports seem to always use the report suite default currency.
I have confirmed that Analysis Workspace is not honoring the currency configuration under Report Settings. I will get an incident(ClientCare) opened in your account and a bug raised with Engineering team.