FM 11 and entities

We have a process for typesetting large amounts of text which involves importing SGML content into FM11, and then importing formats and element definitions onto that content.

We recently upgraded from using FM6, and with that previous version of FrameMaker, when the content contained an unusual entity (e.g. a letter i with a macron above it), the system would default to using a different font in which we had the correct symbol for the entity. Unfortunately we cannot work out how to get FM11 to replicate this, so end up with question marks replacing the entity.

We do not currently use a Structure Application or DTD, and have a very simple default.rw file:

fm version is "11.0";

/*

* Include all ISO entity mapping rules.

*/

#include "isoall.rw"

element "Paddr" is fm footnote element;

element "Paddrstart" is fm footnote element;

What is the best way to get FM11 to recognise that these entities need to use a different font? I've tried looking in the various online documentation pdfs, but couldn't see how to solve this problem.

Thanks

Katy