Split Valuation in MDG

Using MM02 in MDG hub I can add Valuation Category MBEW-BWTTY for a material. But when I tried to add valuation category MBEW-BWTTY for a list of Materials in MDG using File Upload process(Material Valuation entity), Outboud idoc triggered but doesn't capture BWTTY value in MBEW segment. It still allowed me to add Valuation type thru File upload process for those materials with valuation category assigned already. Help on this is appreciated.