HONG KONG, April 22 (Reuters) - Brilliance China Automotive Holdings on Thursday posted a 44 percent rise in 2003 net profit, but came in under expectations, as sluggish performance by its home-grown sedan model partly offset solid sales at its core minibus line. For this year and beyond, earnings at China's largest minibus maker are expected to be fuelled by sales of the BMW AG luxury sedans that it began making late last year under a joint venture with the German luxury car firm.