Virtuemart 3.8 Coupon code issues

[centurius]

Hello,
I would like to ask if somebody has faced such an issue.
In Joomla backend if I add a new coupon it does not work correctly in case I want to exclude some products categories.
When I do not touch allowed products categories it works fine, but when I tried to exclude some categoories it did not work.

Another issue, directly in eshop, in cart subpage if I put a new coupon code and I try to confirm by SAVE button, nothing happens, like the button woulld be non-sensitive.

Virtuemart 3.8.8
Joomla 3.10.0
plus one page checkout plugin 

Thank you in advance for any the help
Rado

[Jörgen]

Try witkout the one page plugin.

Jörgen @ Kreativ Fotografi

[centurius]

yes I can check whether the problem is in one page checkout plugin or in virtuemart itself

thank you
RH