for my $level1_ref (@{$report_config->{"levels"}->{"level"}}) {
   print...
}

##</code><code>##

<config>
	<levels name="a" target="29.6">
		<level name="b"	weight="50" target="35.1">	
			<study id="32" name="i"	weight="30" />
			<study id="36" name="j"	weight="70" />
		</level>
		
		<study id="37" name="k" weight="15" />
		
		<level name="c" weight="13" target="22.1">	
			<level name="d" weight="69.2">	
				<level name="e"	weight="44.4">	
					<study id="34" name="l"	weight="50" />
					<study id="27" name="m"	weight="50" />
				</level>
				<level name="f"	weight="55.6">	
					<study id="25" name="n"	weight="60" />
					<study id="38" name="o"	weight="40" />
				</level>
			</level>
			<level name="g" weight="30.8">	
				<study id="50" name="p"		weight="75" />
				<study id="70" name="q"		weight="25" />
			</level>
		</level>
		
		<level name="h" weight="22" target="19.0">	
			<study id="40" name="r"		weight="90.9" />
			<study id="22" name="s"		weight="9.1" />
		</level>
	</levels>
	
	<study id="19" name="t"		weight="0"	spec="p0f7=2" />
	<study id="19" name="u"		weight="0"	spec="p0f7=1" />
	<study id="62" name="v"		weight="0" />
</config>