I have a large board that as some major edits, there is an existing bed of nails for test so all vias have to stay in the same location.
I have glued down the vias in my current layout, but when I import the ECO from the schematic some of the vias get removed.
I have discovered the vias which have more the 2 connection points are not removed, but via's with just 2 connection points are removed. The major changes on the board are two IC's are changing from TQFP to BGA, so for most 2 connection point signals have the same start point (eg. R1.2) but have a new end point (from U1.2 to U1.25).
Anyone got any ideas ?