Normal Domestic Return & Last Taxes

We did normal domestic sales order when we are going to dom return then document take last taxes which is for last document

In domestic sales order invoicing is done with qut 1600 so tax calculated like 66000 but when we do the return for 50 quantity then the order still take 66000 tax what was the issue

Please help

Message was edited by: Jyoti Prakash - Please use precise and meaningful discussion title to represent your discussion. Don't put whole body text in title.