Got request from customer to list all item (and variant) with their latest cost price so this is the solution (download the xpo here) you can see we are using aggregate max on activation date,  

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if you using aws for your ubuntu vps instance, just do this step1. check your log on /var/log/2. check your linux kernel header if your linux kernel header is too big, just purge itsudo apt-get autoremove and keep your header i did that and freed up until 2.9GB

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