Find out the filed of open item in BSID TABLE

Hi Expert ,

I need to find out the total value of amount of local currency for a customer and consider only open item with the red symbol. I used BSID table and filed DMBTR for (amount in local currency) , but i am not able to find how we consider in BSID table only for open item any field in BSID table that we can check this item is open item.