Each part has its positioning. The positioning of the next part is a function of the previous part, which means that by moving the first part, the second will not move dynamically, but will wait until the first part is in its destination position before being calculated and positioned in order to have very short calculation times. With these conditions, it is impossible to position 3 parts together if the third is positioned on the first 2 without grouping the positionings. There are 2 methods: Either turn on the Include in Last Positioning mode before positioning, or if this is already done, merge them.
