In CAD systems there are linked elements (usually surface elements: cylinders, cones, planes) and elements to which the PMI is attached (usually line elements: circle, straight/edge, point). The elements for pinning are decisive for the graphical representation. To process the PMI functionally, the linked geometry is necessary.
At best, all elements must be entered correctly during construction. Then CALYPSO's PMI can also be interpreted correctly. For this, however, the designing engineer must needs to have some metrological knowledge in order to be able to define which elements must be measured. He must then link these elements with the PMI.