How can I include "None" functionality in a LOV

I am trying to setup the ability to set a value to null in a Popup LOV giving my users the None functionality. This is the SQL I use to ccreate the LOV:
select 'None'VALUE,
Null UID
from dual
UNION ALL
select VALUE,
UID
from LOOKUP_VALUE
when I select the None from the list and try to create the record I receive:
ERR ERR-1023 Unable perform validations
ORA-01722: invalid number
Any idea on how to allow None type functionality?

Thanks Sergio;
You are right I am trying to insert a NULL into a number column. When I add a row and do not put a value in this column it is ok because the column is defined to allow nulls. If I put a value in this column and later want to change the value nothing (NULL) is when I have the problem. I could create a None value for all my LOV and use it but I would rather just remove the value from the column and leave it NULL.
Chris

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