Global preConditions with grails plugin?

I am using the grails liquibase plugin. Is it possible to have a preCondition that applies to all changesets in a particular file (databaseChangeLog closure?). I have tried placing a ‘preConditions’ in the higher level file that includes the target one, and also within the target one that contains all the changeSets to be ‘guarded’ by the precondition, but in both cases I get:

liquibase.exception.ChangeLogParseException: liquibase.exception.SetupException: org.grails.plugins.databasemigration.DatabaseMigrationException: Unknown method name: preConditions
at liquibase.parser.core.xml.AbstractChangeLogParser.parse(
at liquibase.Liquibase.getDatabaseChangeLog(