This method is called each time you access a slot by <slot>. It checks the state of internal integrity flags in order to guarantee, that the slot you want to access has a value, consistent with the rest of the model.
For example, if you run crp.CSFP (complete calculation of the model), then change loss.unit by loss.unit(MyModel)<-... to another value (which causes a call to set.changes ) and want to access EL.crp, a warning message is printed because you did not recalculate EL.crp. Instead you have to run calc.portfolio.statistics, loss.dist and measure again to get the right value for EL.crp.
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