Object Trigger - create record in another BO

Summary

Object Trigger - only create if the record does not exist in the target BO

Content

Hello,

I have two BOs.  One BO stores balances by various attributes.  I have an Object trigger on this BO that will create the record in another BO as long as certain fields are not present in the BO.  For example, the source BO has fields for Fund, Period and Balance.  If the combination of those fields does not exist in the target BO, then create the record.

I cannot seem to programmatically access the fields in the target BO using object trigger.