Repack entry giving value differences

Hi community!

I want to buy a “Yellow pen” then sell it to be “Yellow cool pen”
I had tried to follow the documentation using repack entry
https://docs.erpnext.com/docs/v13/user/manual/en/stock/articles/repack-entry
But, I notice there is a value differences


How do I avoid that value differences, thanks in advance :wink: