If you arent a farmers allliance (those annoying ones in Kyushu that always disrupted my diamond trading in 4.83-4.84) or Xeno, you shouldnt be asking to drop cargo. Simply because it does not make sense. Why would you destroy your profits? Most pirates/unlawfuls steal the commoditys they ask to drop. Dropping all cargo and taking all profits is unnaceptable and not fun for the trader, unless your a Xeno and your doing it to a foreigner. Thats justified.