You can use RoboDK to calibrate KUKA robots that have already been calibrated by KUKA using the Absolute Accuracy option. However, you should make sure to deactivate this option in the KUKA robot controller. When you calibrate a KUKA robot that has already been calibrated by KUKA using the Absolute Accuracy option it is important to deactivate this option so you can calibrate it using RoboDK.
To deactivate KUKA’s Absolute Accuracy you should set variable DEACTIVATE_ABS_ACCUR to TRUE. You can find this variable in the file KRC:\STEU\MADA\$custom.dat (around line 73).
You can make sure that KUKA’s absolute accuracy option has been properly deactivated by moving the robot to a known position (for example, move the robot axes of the real robot and in RoboDK to the home position) and make sure the Cartesian position displayed by the robot controller matches the same Cartesian position displayed by RoboDK.