[TYPO3-dev] TCA - set field to NULL

[Klaus Hinum]

Hi group,

as I found no answer in the documentation and hours of try out, i think 
i found an important missing feature regarding the TCA configuration of 
fields:

I was not able to set an integer or real field NULL. The default option 
"NULL" or checkbox "NULL" does not work and if i delete a field or leave 
it empty it gets 0.

The same applies for date fields as someone posted in the english 
mailing list.

In my example it is very important to differ 0 and null, because if the 
value for the field is unknown it is different than 0 (0 apples are 
different than an unknown amount of apples).

regards
Klaus