Thanks for your hint Monkwarrior!
I tried your syntax but again without success,for one turn population level fall on lowest level of 400 men
It's seems that script recognize "Carthago SettlementPopulationMaxedOut" as condition it also works well with if statement, but problem is that this "recognition mechanism" works only one time and if it works script begin reducing population all time.
I used endturn button because I tried prevent script from momental falling of population level.

PS:pardon my bad english