The July vaida failed to maintain overnight firmness on the forward cottonseed oilcake market on Thursday in the process of trading, dealers said. The July vaida closed at Rs 1847.50 and it opened with a fall of 50 paisa at Rs 1847.00 in the morning session, they said. The December vaida ended at Rs 1400.00 and opened with no change at the same rate, they said.