Hi,
You can just do a "Retrieve Account from DB, First". If you setup your security such that a user can ONLY read his own account. Nanoflows always apply security.
regards, Fabian
EDIT: as a workaround, if you cannot change the security like that (e.g. because you need to be able to view accounts) you could generate a special entity for that to which ONLY your user has access. I never build that, though.
Would it be sufficient to use the owner member . This should store the current user in an association.