Bug 167545 Copy a cascading parameter group and paste it to another parameter group causes an exception thrown
Steps to reproduce: 1.Copy a cascading parameter group using short cut key "Ctrl+x"/"Ctrl+c", or choosing context menu "Cut"/"Copy"; 2.Paste it to another parameter group using short cut key "Ctrl+v", or choosing context menu "Paste"; Expected result: The source one is pasted in the destination. Actual result: An exception thrown org.eclipse.birt.report.model.api.command.ContentException: The Cascading Parameter Group("Source") is not allowed in the slot (parameters) of Parameter Group("Destination").
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
}
		}
		return null;
	}
	/**
	 * Add a binding column on the given element
	 * 
	 * @param handle
	 *            the handle of the elementIt should be a ReportItemHandle or a
	 *            GroupHandle
	 * @param column
	 *            the column to add
	 * @param inForce
	 *            true to add the column with duplicated expression,or false not
	 *            to do
	 * 
	 * @return the handle of the binding column,or null if failed
	 */
	public static ComputedColumnHandle addColumn( DesignElementHandle handle,
			ComputedColumn column, boolean inForce ) throws SemanticException
	{
		Assert.isLegal( handle instanceof ReportItemHandle );
		return ( (ReportItemHandle) handle ).addColumnBinding( column, inForce );
	}
	/**
	 * Returns the binding column iterator of the given element
	 * 
	 * @param handle
	 *            the handle of the element. It should be a ReportItemHandle or
	 *            a GroupHandle,or an empty iterator will be returned.