Not working with Bulk Discount Plugin

Did you know your plugin is not working with the Bulk Discount Plugin from Rene Puchinger which is widely used.

Cart calculation incl. discount is not adding up to (sub)total in the check out. The client is not getting the discount they want ??

Furthermore I like your plugin together with the Premerce User Roles. Easy to set up a wholesale functionality.

Hope you can figure this one out for me.
Cheers!