Bug 179743 Parameter Validate Event is not Called
I have tested the validate event on parameters and it never appears to get called.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
}
			else if ( DesignChoiceConstants.PARAM_TYPE_DECIMAL.equals( type ) )
			{
				return DataTypeUtil.toBigDecimal( value );
			}
			else if ( DesignChoiceConstants.PARAM_TYPE_FLOAT.equals( type ) )
			{
				return DataTypeUtil.toDouble( value );
			}
			else if ( DesignChoiceConstants.PARAM_TYPE_STRING.equals( type ) )
			{
				return DataTypeUtil.toString( value );
			}
			else if ( DesignChoiceConstants.PARAM_TYPE_INTEGER.equals( type ) )
			{
				return DataTypeUtil.toInteger( value );
			}
			return value;
		}
		catch ( BirtException e )
		{
			log.log( Level.SEVERE, e.getLocalizedMessage( ), e );
		}
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api2.IRunAndRenderTask#validateParameters()
	 */