Help Up-sell and Cross-sell field is missing

Hi guys,

some help needed, i was adding products in my woocommerce and when i want to set up-sell and cross sell, no field is seen, just a vertical line, please see picture attached.
http://s13.postimg.org/trl6r4g5z/image.jpg

I’ve searched for solution in google and also forum, but can’t seem to find a solution.

woocommerce version – 2.0.20 ( can’t upgrade because theme cannot support 2.1)

Any advise is greatly appreciated.Thanks

https://wordpress.org/plugins/woocommerce/