This question refers to: Work visa and work permit exemption for German citizens in Turkey. Short summary: I have to go to Turkey for a week to configure a system that my employer has sold through our Turkish partner.
At the moment, only a visit of one week is planned. However, it is likely that there will eventually be updates to the system, and at least for major updates, our local partner may need assistance. Considering that I'll be the one who knows the system best, I'll probably be the one to be sent to help with such updates.
So, while at the moment there is only one visit planned, does it make sense to apply for a multiple-entry visa, even if I do not know when or if I will go there next?