Loading data Error

I am unable to load data into the database using Update data activity. My schema does not have any primary key as none of the records are unique. So I have declared autopk="true". Here is the workflow

Can someone please suggest on how to update such data? Do i need to use

a. "Directly using the target dimension"

b. "Using one or more link"

c. "Using reconciliation keys"

In my case when i don't have any primary key how do i select from the options above.