LOV with Select Union - ERROR 30049

Hi, guys.
I'm facing some troubles to deal with Select Union in a Lov.
When I'm trying to run the forms, it shows me the error FRM-30049 in column mapping properties.
Actually, I don't know if Forms supports it. The code below worked out in ORACLE SQLPLUS.
Follows the code:
SELECT (SUBSTR(cust_name,1,15) ||' - '||'Customer'),
cust_cod
FROM customers
UNION
SELECT (SUBSTR(supl_name,1,15)||' - '||'Supplier'),
supl_COD
FROM suppliers;
May someone give me a hint?
Thanks in advance.

I'm sorry.
I've found my error. It was just necessary adjust the column mapping long propertie.
Now, it's working.
Sorry, again.
Have a nice day.
Thanks anyway.

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Maybe something the JHeadstart can pcik up in the next release of JHeadstart :-)
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