Compa-Ratio and PIR Calculation problem

Hi All,

In Compa-ratio and PIR calculation...if the employee has had no increase in pay last year..but the salary range is increased, in such a case the calculation seems to be wrong as it just picks up the begin date of IT0008 infotype.

Is it ok to pick up the pay structure date or the begin date of IT0008 whichver is latest??