Bug 135265 Paste to a wrong column
Steps to reproduce: 1.Open the attached file 2.Choose the column[2] which contains a label , copy and paste to column[3] Expected result: It will be pasted to column[3] Actual result: It is pasted to column[4] The related bug is #103448
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/ReferencableStructure.java
* Adds a client structure of this.
	 * 
	 * @param struct
	 *            the structure that refers this struct
	 */
	public void addClientStructure( Structure struct )
	{
		clientStructures.add( struct );
	}
	/**
	 * Drops one of the client of this structure.
	 * 
	 * @param struct
	 *            the client to drop
	 */
	public void dropClientStructure( Structure struct )
	{
		assert clientStructures.contains( struct );
		clientStructures.remove( struct );
	}
	/**
	 * Returns all the client structures.
	 * 
	 * @return all the client structures
	 */
	public List getClientStructures( )
	{
		return clientStructures;
	}
}