I get the exception:
arithmetic exception, numeric overflow, or string truncation

when executing:
EXCEPTION E_NOTHING_TO_INVOICE 'There are no uninvoiced Pharmacy bill
group fees for ' || BILLGRP || ' from ' || BDATE || ' through ' ||
EDATE;

The variables are:
BILLGRP Char(3)
EDATE Date
BDATE Date

If I run it in the debugger under Database Workbench, it works fine (the
correct exception gets thrown). If I change the line to:
EXCEPTION E_NOTHING_TO_INVOICE;

it then works fine.

I'm running FB 1.5.2.