Pages based on sheets with HQL Select-Statements need to be saved with administration-rights

We got some strange behaviour when creating new pages based on a sheet that contains velocity-scripts with some hql-queries. New pages based on the sheet can be created by every user and nearly everything works fine, just the results of the select-statements doesn't show up. Seems that an empty resultset is returned. When storing the newly created page with admin-rights everything (including the queries) works fine.

Parts of the code with the query:

#set($sql = "select doc.fullName, doc.name from XWikiDocument as doc where (doc.hidden <> true or doc.hidden is null) and doc.space='${doc.space}' and doc.content like '%$doc.name%' order by doc.name asc")
#set($results=$xwiki.search($sql))
#if ($results.size() > 0)

... -> is empty when the page based on this sheet is saved without admin-rights