Purchase Return Exceed Inventory Value

[ahmadnb]

Hi , using perpetual accounting

Could anyone tell how to solve this problem

assume a company make the following transaction

1-1-2010
purchase 1 item @ 100 $ (cash)

1-6-2010
purchase 10 item @ 10$ (cash)

1-9-2010
sale 10 item @ 30$ (cash)


Now ending inventory using (average weight method) will be 1 item @ 18.18

if we make the following transaction
1-1-2011
purchase return 1 item @ 100$ (cash)

this well make inventory has credit value (18.8 - 100) = -81.82 which can't be right !!

how should i record this

should i add the difference as other revenue, or credit the cost of good sold ?

Thank You