I read the answer to a previous post on advanced formatting but I couldn't
get it to work in my case.

I would like to display "OK" or "ERROR" in a field with a logical expression
resulting in TRUE/FALSE.
How should this change ?...[<1]0" Children";[=0]0" Child";General
I tried [=TRUE] "OK";[=FALSE] "ERROR";0 but it didn't work

Please note that I cannot use General due to regional settings