I believe the built-in paste does not work with multi-currency or intercompany.
If you feel adventurous, I built an add-in that accomplishes this (with the addition of AP and Sales distribution pasting), however I only tested it with USD&CAD as the currencies but I do not see why it would not work for ARS. Mine will post in the originating amount of whatever currency you select.
jamesdlyn.wordpress.com/.../gp-paste
Let me know if you have any issues!
James