Dear all,
After setting the project and iso styles for the plant, while generation the iso we have noticed about 20 % of the isos(total Isos 300 approx) went wrong in terms of coordinates (E, N & EL)i.e you have a main line going through the plant and you have tie-ins to connect to each equipment. The coordinates of the tie-ins went completely wrong(different level east and north values) on the isos. Whereas the coordinates of tie-ins on the main line was ok on the iso.
We finally got the solution, when you tie -in to a main line , a connection node is created and it has been assigned to the line number. If the connection node has been assigned with the tie-in line (line number) the coordinates will be wrong on the isos. But if the connection node has been assigned to the main line (line number) then you shall have the correct coordinates.
If someone came across this issue please let me know...