Olet pipe branch not resizing

I'm making a custom olet for a pipe branch. Its really a compensation pad for a GRP pipe branch and its similar to the picture attached.

The pad connects to a route ok, however the pipe branch doesn't resize correctly. It just applies the same diameter as the main header pipe.

Has anyone encountered this before, or know how to rectify this issue?

Any help would be greatly appreciated.

general24.jpg

SolidworksRouting