@matigo It is actually quite fun. But it should be ready soon (preferably it should have been ready before I started working on it), which gives me pressure once again.
The actual issue here is the fact that the customer wanted to order the sales feature that uses this generic thing I have created from another company. I have not been involved with the feature ensuring that things work as expected. Some customer representatives have said directly that it was a mistake that they didn't buy the feature development from us in the first place.