[KotOR scripting] Manaan port fee bug

Hello!

I hope somebody can help me figure out how to solve this problem I encountered in Manaan.

SITUATION:
----------

The player should pay a fee to enter Atho City every time he flies to another planet and then returns to it.

BEHAVIOUR:
----------

In the unmodded game, the door to Atho City is kept open after the player has paid one first time. After opening it to access the city, it stays open without the need to pay any more money to the Selkath Port Guard. If the player talks to the Port Guard after having paid the fee once and having returned to the planet after having left it, the Selkath Port Guard either tells that he doesn't have time to talk to you or informs the player about having to pay the docking fee again, depending on whether or not the player invaded the Sith Embassy. In the latter case, it will ask again for money if you start again the dialogue (another bug). But refusal has no consequences since the door to Atho City is not closed.

INTERESTING FILES:
------------------
man26_selport.dlg
k_pman_26c_area.nss
k_ebn12_messon.nss
k_pman_planet19.nss
k_pman_planet20.nss
k_pman_planet21.nss
k_pman_port01.nss
k_pman26d_enter.ncs (DeNCS CAN'T DECOMPILE!)
k_pman_locked03.ncs (DeNCS CAN'T DECOMPILE!)
man28ac_door02.utd

VARIABLES:
----------
K_MAN_PORT_FEE
MAN_PORT_ZONE
MAN_PORTF_DONE

DESIRED RESULT:
---------------
The door to Atho City should close and lock again after the player has left Manaan for another planet.