PK parameters during multiple dosing

[SCZ1174]

Hi everyone,
In multiple dosing, why does PK-sim not calculate a parameter "AUC_tDLast-tEnd", which means "Area under the concentration vs. time curve from the time of the last dose to the last data point"? When there are fewer observed values (Sampling time ends too early), this parameter is highly significant.
One way to accomplish this is "AUC_tEnd-AUC_tEnd (0-tDLast-1)", but that's too cumbersome.