Oracle / PROP:NullsInKeys

in Clarion 11.0.13175 there is mentioned the following feature:

FEATURE: Oracle driver: You can now turn off the generation of “NULLS FIRST” and “NULLS LAST” in the Oracle driver using PROP:NullsInKeys

Does anybody know, it this specific for a table or a property I can set for all tables and in what embed (dsa oder main oder every app)?
I don´t find anything here in Clarion help!