Help needed for command lists within lists and RPGIV

Dear All,

My brain has gone to sleep today...

Given the following portion of a command definition, how do I define the
incoming parameter in RPGIV for the 'Period'???

    Parm       Period                                                 +
               Type( EPeriod )                                        +
               Prompt( 'Time period for log output' )

 EPeriod:                                                             +
    Elem       Type( EStrTim )                                        +
               Prompt( 'Start time and date' )

    Elem       Type( EEndTim )                                        +
               Prompt( 'End time and date' )

EStrTim:                                                              +
    Elem       Type( *Time )                                          +
               Prompt( 'Beginning time' )

    Elem       Type( *Date )                                          +
               Prompt( 'Beginning date' )

EEndTim:                                                              +
    Elem       Type( *Time )                                          +
               Prompt( 'Ending time' )

    Elem       Type( *Date )                                          +
               Prompt( 'Ending date' )

Like I said, my brain really is on go slow today... I've done this so
many times before but today I need help... BADLY!!!

Regards,

Gerry Tucker
Technicolor Distribution Services
Wembley, England