If you make GD’s AN line’s profits -300, designate the stocking status as “self-cancellation,” and make the whole line grey, the cancel process is finished.
Input -300 for the profit at column AN in GD, set the purchase status "cancel by own company", and gray the entire row to complete the cancellation process.
To finish a cancellation, at first change the benefit on GD of a line AN into -300, also change stock status as "a company cancellation", then change the color of the line into gray.