zero qty in finished production order

Prajeesh

I have noticed that in my chart of accounts the inventory of WIP is showing a negative figure and a positive figure on inventory finished goods. And when i checked i found that one of the finished production order is posted zero quantity in first line and the quantity in second line. When i run Adjust cost - item entries it shows an error that " division by zero 0/0 " And when i tried to delete the 0 qty entry from the production line table it is not allowing as well. can anybody look into it....

Prajeesh