We created 2 isometrics for line O7471 and O7472 (see attachment).
Now we have a difference in coordination values between the connecting points.
Line O7471: E 10372 N 10976 EL +1544 (Not correct).
Line O7242: E 10469 N 10937 EL +1544 (Correct).
All other values on the isometrics seems to be oke.
Who know what goes wrong?
Change your regional settings to English (United Kingdom), and run your line aggain.
May be this helps