Enable Inheritance

Still new to projectwise and i have newbie question

(try to post in another forum (projectwise integration server) but could not validate if the post was successful)

I have a main project under which i have sub-project (level1) that contain as well sub-project (level2)

When I select a sub-project on level 1 and i loof at the Project/Folder security, on the first column we have a symbol with a green arrow indicating the security is Inherit from higher level project

I have one of the sub-project on the level 1 that miss those green arrow.

How can I restore those inherent rights? is there a check box I can tick?

Below is a screen capture to illustrate my question