Hi,
In the LPA, in general there are two parts of calculation. First part is to determine last period for the periods of time level requested by user (i.e. time at Request level). As a part of this calculation, following attribute transformation is used:
PERIODID@PER1="HKFPER@PER"
Becuase of the above calculation HKFPER is also available at PER1.
In fact this calculation can be reused in all LPA calculation.
Hope it helps.
Regards
rinju