This is the code in My ComboBox drop down list maybe something added to it:
To show Horses that are in tblInvoice_ItMdt as well
SELECT tblHorseInfo.HorseID, funGetHorse(0,tblHorseInfo.HorseID,false) AS
Name, [StableReturnDate]
FROM tblHorseInfo
WHERE Status LIKE 'Active*' AND
tblHorseInfo.HorseID NOT IN
(SELECT HorseID FROM TblInvoice_ItMdt)
ORDER BY funGetHorse(0,tblHorseInfo.HorseID,true),
funGetHorse(0,tblHorseInfo.HorseID,false);
Thanks Bob