An improved method implemented in a print job management apparatus for processing print jobs in a multiple-printer print shop environment is described. When an operator manually assigns a print job to a printer, the job ticket settings of print job are compared with capabilities of the printer to detect any constraints (i.e. incompatibilities). Messages including textual descriptions of the detected constraints are displayed in a UI, and job ticket settings that caused each constraint are displayed adjacent the corresponding message. The job ticket settings display allows the operator to change values of the job ticket settings and then re-evaluate the job assignment to detect any further constraints. The display and input steps are performed using a single UI. The changed job ticket settings are kept in a temporary version of the job ticket, and the original job ticket is updated with the changed values when the job is finally printed.