SQL Merge into - delete ne marche pas

Voici mon script:

L'update puis insert marchent mais update + delete puis insert ne marchent pas....please HELP!

Code:

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MERGE INTO IO_CDE_MAG c
  USING ds_cde_mag_0011_merge s
  ON (c.NUM_PLAN_DOSS=s.NUM_PLAN_DOSS and c.CODE_MAG=s.CODE_MAG)
  WHEN MATCHED THEN 
                    update set DATMOD='20080626'
               delete where (NUM_PLAN_DOSS='100059' )
WHEN NOT MATCHED THEN        
                  INSERT (
                 NUM_PLAN_DOSS,
              CODE_MAG,
              CODSOC,
              NUM_CDE_MAG ,
              DATE_INTEG_CDE,
              HEU_INTEG_CDE,
              NB_LIG_ENT_RCUE,
              NB_LIG_ENT_AINTEG ,
              NB_LIG_ENT_ACC,
              QTE_UV_ENT_RCUE ,
              QTE_UV_ENT_AINTEG ,
              QTE_UV_ENT_ACC,
              AREC ,
              DATMOD,
              UTIMOD ) 
        VALUES (  s.NUM_PLAN_DOSS,
                  s.CODE_MAG,
                  s.CODSOC,
                  s.NUM_CDE_MAG ,
                  s.DATE_INTEG_CDE,
                  s.HEU_INTEG_CDE,
                  s.NB_LIG_ENT_RCUE,
                  s.NB_LIG_ENT_AINTEG ,
                  s.NB_LIG_ENT_ACC,
                  s.QTE_UV_ENT_RCUE ,
                  s.QTE_UV_ENT_AINTEG ,
                  s.QTE_UV_ENT_ACC,
                  s.AREC ,
                  s.DATMOD,
                  s.UTIMOD   );