Hi,

Working with IBO 4.1Aa and FB 1.5, I have a peculiar effect on an embedded
Lookupcombo:
Previously, the lookupquery just supplied all values from the underlying
table (just a handful of values), so that the user could also select values
already defined for an n:m table, though posting the new record is prevented
by a unique index. Since this produced an ugly error message, I redifined
the lookupquery so that only those records not yet in the n:m table are
shown.

SELECT ID
, MASCHINENAME
FROM TABMASCHINES
Where ID NOT IN
(Select MASCHINEID
FROM TABMASCH_FOR_WPSTEPS
WHERE WPSTEPID=:WPSTEPID)

Now I have the effect, that the value in the combobox becomes invisible as
soon as the lookupcombo in the n:m table gets the focus.

I have prepared a testcase: http://www.marion-hector.de/Testcase.zip

Florian