This is a request to make it possible to fix certain visits so they must occur at a specific time and be assigned to a specific employee (or vehicle). Some operations manually schedule part of their work in advance and want to ensure these fixed visits remain unchanged during optimization.

Currently, the workaround is to model such visits as fixed breaks with locations, but this approach causes issues - especially with technician cost calculations, metrics accuracy, and visit groups. The requested feature would allow users to mark a visit as fixed (with its assigned resource and start time).