Hi Displayframesuk,
I apologize for any inconvenience caused.
We have set up a configuration like the one you are talking about on our test site and it works fine.
Please, can you open a private ticket in order to investigate? There you will be able to provide us with your website credentials and we will take a look to see what is happening.
This is the link to open the ticket: https://stockmanagementlabs.ticksy.com/ticket/
Remember to make a reference to this post.
Best Regards,
Juan Antonio.