Why isn't DW letting me remove a Begin Editable tag from my HTML document

Right, this is making me really angry now. I tried to move a 

BeginEditable

tag from one part of the HTML document to the other, but sintead it duplicated it. Now I'm getting the error message:

There is an error on line 88, column 51 <file path> InstanceBeginEditibleTac inside Editible region.

 I am aware of the reason why the error message is orrucing, but now DW won't let me get ris of it. If DW just copied it and not duplicated this - and did as I asked it to, we wouldnt be in this mess

<div id="breadcrumb">
	<ul>
		<li>You are here:</li>
		<li><a href="../index.html">Home</a></li>
		<!-- InstanceBeginEditable name="breadcrumb" -->
		<li>&raquo;</li>
		<li><a href="#">News</a></li>
		<li>&raquo;</li>
		<!-- InstanceBeginEditable name="breadcrumb" -->
		<li><a href="#">Cookie Policy</a></li>
		<li>&raquo;</li>
		<li><a href="#">Cookie Policy</a></li>
		<li>&raquo;</li>
		<li><a href="#">Security</a></li>
		<li>&raquo;</li>
		<li><a href="#">Your rights</a></li>
		<li>&raquo;</li>
		<li><a href="#">Contact us</a></li>
		<!-- InstanceEndEditable -->	
  	</ul>
</div>

 How do I get rid of the lower <!-- InstanceBeginEditable name="breadcrumb" --> because this is making me really cross now!