UDF of type "Lookup" - doesn't accept "space/Empty" value in lookup defn

Hello there,
I have created a Combo Box UDF field - but I don't want to put any value in it. If I give only "space" in Encode and Decode - it gives error of providing some value to it. I want to give a default blank value over there along with other values so that the user is free to declare an empty value if he/she doesn't wants to provide one otherwise the user has to mandatorily provide some value to this like "NULL/zzz/NOTHING" as a string.
Is there anyway we can achieve this - giving blank value in a lookup/combo field ?
TIA,
- oidm.

I don't think you can enter nulll/space in decode.
For Lookup Field Code as well as Decode can't be null.
If you want to give blank so it is not possible APMK, in decode you can give ---. You can treat it as Blank.
Code Key > NULL
Decode > ---

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