How can i port on a tower

[Buh]

Hey

The one question is: How can i port on a tower?
I will write a bot for the EOJ -Quest -> The end of research (ID : 426327)
I record the point, where the rune is and where the NPC is and tried to port on this building (seems like a tower) for harvesting the rune.
But always when i want to port to this point, it shows me quick on the tower, and in the other moment at the same place like before. And then it wants to run to this point, but this do not work.

Can someone help me with (just) porting on sth?

Greetings ME

and i hope you can understand my situation (even my english xD)