Our technical team has been busy as new feature requests keep coming every week. However this was so important for our customers and to us that we had to make this fix immediately 🙂
So far the logic of add-on services was tied to primary service. For e.g. if the primary service was hair-cut, the add-on services were defined so they were relevant for e.g. hair-colour etc. However, we found that it might be true for users but businesses should be allowed to add any add-on service.
With this release, businesses can add any add-on service(s) to existing bookings even if those add-on services belong to other primary services.