VM3.0.7 Category ordering in back-end does not work when ordering set to 0 in db

[stawebnice]

Hi,

I have Virtuemart 3.0.7 at  test server http://tendence.athenas.cz/ and I imported there categories with no ordering (export does not include it)

I set the category ordering to Ordering http://imtp.me/9dn302lj3.p

but in category list in back-end all categories have ordering 0, then there are no arrows up and down and no way to set the ordering  because even when I open a category and select another to precede and save it, there are still zeros.

so I have to go to database and set the ordering manually there in _virtuemart_categories table.

when I save it there,then the arrow appear in back end category list.
http://imtp.me/9dn802lj3.p

is there a way to set ordering from back-end when the ordering is set to 0 in database, please?