Good sold in 2014 and returned in 2015

Are you passing entry in books of Standard costing??

However, In financial accounting, whats the need to pass the entry of Cost of Sales Dr. and Inventory Credit? Its not correct way to record

Just pass Sales Retur Dr. and AR Cr. in the year of return

Thanks for your reply.

dr sales return and cr AR means we decrease sales and decrease receivables right?  , how do we record the inventory which has come back? 

With regard to your other question, dr CoS and Cr Inventory, this entry is made to record the purchase of goods worth 3000. 

Stock is included in the year end by a Journal Entry, It automatically gets accounted.

It is not required to pass an entry of cost of goods with every entry of sale.

Total purchases are passed as Purchase Dr.  to Bank/ PayableCr.,

Total sales are passed as AR/ Bank Dr. to Sale Cr.

Closing Stock is valued Separately at the year end and year ending entry is passed as Closing Stock Account Dr. Profit & loss Account Cr.