Hi Victor
I almost beat the system, trailing a little solution for your issue:
In advanced pricing you can create a variable (eg 'ZERO') with value zero
Create a formula eg ZERODIV = 1/&ZERO
Call the formula at the maximum qty level break in an existing or new adjustment within your schedule.
When a qty > level break is ordered, the system will give you an error message (Syntax not found), but unfortunately P4210 will also freeze and the only way out is to re-start.
Alternatively you can increase the price to something ridiculously high once the maximum level is exceeded
Neither solution is particularly elegant, but it may just do the trick!?
Rgds,