Deleting a Relationship Between a Price Level and a Price List via API

<winstrom version="1.0">
	<cenik>
		<id>133</id>
		<cenHladiny>
			<cenova-uroven action="delete">
				<id>6</id>
			</cenova-uroven>
		</cenHladiny>
	</cenik>
</winstrom>