I imported some data from Excel, with field names.
I added some fields: eg, DOE and id.
I made the id: required and non-modifiable.
id was blank on the records imported.
FMP HUNG because I couldn't leave the record (b/c id was required) but I couldn't input anything (b/c it was not modifiable).
I force quit the app.
Not real clever, I know, but is there -- or might it be good to provide -- a better way to recover from mistakes such as mine?