Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/SemanticError.java
* @param element
	 *            the element causing this semantic error
	 * @param values
	 *            value array used for error message
	 * @param errCode
	 *            the semantic error code
	 * @param level
	 *            the level of the error. Can be <code>ERROR</code> or
	 *            <code>WARNING</code>.
	 */
	public SemanticError( DesignElement element, String[] values,
			String errCode, int level )
	{
		super( element, values, errCode );
		errorLevel = level;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Throwable#getLocalizedMessage()
	 */
	public String getLocalizedMessage( )
	{
		if ( sResourceKey == DESIGN_EXCEPTION_UNSUPPORTED_ELEMENT
				|| sResourceKey == DESIGN_EXCEPTION_MISSING_EXTENSION )
		{
			return ModelMessages.getMessage( sResourceKey, new String[]{element
					.getElementName( )} );
		}
		else if ( sResourceKey == DESIGN_EXCEPTION_INVALID_ELEMENT_REF