Pax wrap will automagically export the packages from your regular jar using bnd. Sometimes the generated manifest doesn't import all of the packages your bundle needs.
In these cases you need the maven bundle plugin as this will give you more fine grained control over how the manifest is generated.
Sounds like the "Pax Wrap Protocol" uses Bnd with a set of static parameters/options. And the "maven bundle plugin" will allow you to configure/set the Bnd's parameters/options.