ALTER TABLE OM_PARAM_ORG ADD IDATIVO VARCHAR2(1) DEFAULT 'S' NOT NULL 
  CONSTRAINT CKC_IDATIVO_OM_PARAM_ORG CHECK (IDATIVO IN ('S','N'))
/

ALTER TABLE OM_PARAM_ORG ADD NRORG NUMBER DEFAULT SYS_CONTEXT('nrorg_ctx','nrorg') NOT NULL
/