Eye Drops in Bahmni and OpenERP

I am trying to prescribe Eye Drop to a patient. The idea is to instruct 1 drop, 3 times per day for 30 days. In Bahmni that setup calculates 90 drops. However, in pharmacy we normally sell one bottle unit.

I’d like Bahmni ssystem to calculate my prescription to 1 bottle unit. Is this possible ? Or am I missing something here, perhaps there’s a better way of doing this ?. Thanks

Nvm, just found out the 90 drops only appear in the comment. The sellable product is still one unit.