Bug 153853 [Regression]The bound column names must be unique within the entire table.
Regression case Regression_136421(under org.eclipse.birt.report.tests.model) failed. Expected result: Model will avoid adding a duplicate bound column name within a table.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
*            name of the list property
	 * @return the structure list, each of which is the instance of
	 *         <code>StructureHandle</code>
	 */
	List getStructureList( String propName )
	{
		List list = new ArrayList( );
		List tempList = getNativeStructureList( propName );
		if ( !tempList.isEmpty( ) )
			list.addAll( tempList );
		List theLibraries = getLibraries( );
		int size = theLibraries.size( );
		for ( int i = 0; i < size; i++ )
		{
			LibraryHandle library = (LibraryHandle) theLibraries.get( i );
			tempList = library.getNativeStructureList( propName );
			if ( !tempList.isEmpty( ) )
				list.addAll( tempList );
		}
		return list;
	}
	/**
	 * Returns the structures which are defined locally in the current module.
	 * This method will collect all structures from the current module file
	 * locally.
	 * 
	 * @param propName
	 *            name of the list property
	 * @return the structure list, each of which is the instance of
	 *         <code>StructureHandle</code>