Poka-Yoke (ポカヨケ, 'error prevention') is a design principle where a process or piece of equipment is structured to make it impossible, or very difficult, to make a specific human error. Instead of relying on operator attention and training on errors to avoid, the process is redesigned so that the error simply cannot occur.
Physical examples: power cables with asymmetric pins (you cannot plug them in the wrong way), fittings that only make sense in one orientation, sensors that stop the machine if a part is placed incorrectly. Digital examples: form fields with validation that rejects inconsistent data, workflows that require approval before allowing the next action, interfaces that show only the legal options for the current context.
In INFOS software, Poka-Yoke shows up in many places: MAXIRETAIL blocks sales that breach credit limits without approval; KORA Productivity prevents production entries at closed workstations; MULTI prevents the posting of documents that would compromise the SAF-T. Each rule eliminates an entire class of human errors that used to be discovered only at audit.