COALESCE( B~BSTKD, C~BSTKD ) AS BSTKD.....LEFT JOIN VBKD AS BON VBAP~VBELN B~VBELNAND VBAP~POSNR B~POSNRLEFT JOIN VBKD AS CON VBAP~VBELN C~VBELNAND C~POSNR GC_POSNR_HEAD