> For the complete documentation index, see [llms.txt](https://help.auxalia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.auxalia.com/plant-tools/plantexpresstools/how-to-use/plantprojectmanager/usage/iso-line-number-node/lock-line-and-issue.md).

# Lock Line and Issue

With the Plant 3D "Lock Line and Issue" you can lock a lin in 3D and prevent users from changing the line.

![](/files/NIcYZKa4mz7QqdT2QZPe)

Locked lines will be shown with a lock symbol.

![](/files/EEoyhNcb35c5LAIGt0B3)

In 3D you see a lock symbol also when you are near an object of the locked line. You also see the info "- Line Number is locked -" in the tooltip of any object of the locked line.

![](/files/Hopjl1PB0neTYit69wkn)

Locked lines can also be unlocked again.

![](/files/biLDH0nteXQ0970t40LY)

Now the symbol in the tree and in 3D is gone.

![](/files/CWHGANhZ2lRX8FL01el8)