Begoña, you might want to comment/vote on this JIRA issue:
CHANGED JQL for built-in custom-field types and ALL JIRA's Field
I'm thinking that this would give you what you are looking for.
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As I know this is not possible. WAS operator is not used for Security Level in JQL
https://confluence.atlassian.com/display/JIRA/Advanced+Searching#AdvancedSearching-Level
- Mirek
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