Prince Pipes & Fittings Ltd

Haven’t tracked this company much but can anyone provide any inputs as to why the operating cash flow is negative for Mar 2020 on screener and moneycontrol ? Is the data correct ?
Also has there been any change in the contribution share of revenues from 2019 data: UPVC, CPVC, PPR and HDPE contributing 71%, 20% 6% and 3% to the topline, respectively