I belive I understand this behavior just not the reasoning behind it.
As you may all know, Filemaker locks a parent record in an interface when one user is editing one of it's children through a portal. If another user wishe to edit a different child through a portal in that uses the same relationship, even if in aother layout, they can not because they get the locked record message. This despite the fact that it is an entirely different record they are trying to edit, they just share the same parent.
Does anyone know why this is neccesary? I have eliminated the problem by eliminating the portal element and redesigning the interface to use a list view instead but I would like to better understand this behavior.