Required for the synthesis of the beta-hydroxy acid moiety of rhamnolipids. a (3R)-hydroxyacyl-[ACP] + NADP(+) = a 3-oxoacyl-[ACP] + H(+) + NADPH Lipid metabolism; rhamnolipid biosynthesis. Belongs to the short-chain dehydrogenases/reductases (SDR) family.