Where did you hide, Last Portal Row??

Everyone knows the ad hoc portal needs to be on the current layout in order to have Go to Portal Row to work.

What I seem to have just learnt is the option needs to be reachable on the current layout as well, not only the portal.

I mean: if you use Go to Portal Row [Last] and the last row is, say, the sixth one and you have only 5 rows in the portal design, scriptmaker actually goes to row number 5 (last reachable one). Of course you may want to add a scrollbar to the portal and everything goes well.

I understand the portal needs to be on the current layout (and first one in stacking order) because it is the only way you have to teach FMP what sort order you want to determine the position of the row. However, once the portal is well defined, I don't know why the target row must be reachable.

I can't figure out why this has to be like this, but it seems to be: scriptmaker acts with portals kind of 'manually'. Not with other elements, though. This may be called a feature.

Am I right?