Refreshing calc (sum) fields

In a "Bookings" table, I have a calc field, "TotalBookingCost", which
is defined as "sum ( BookingLines::BookingLineCost)", i.e. it's the
total of the costs of the individual lines that make up the booking.
BookingLineCost is also a calc field, based on rates, duration, etc.

I have a layout based on Bookings, with a the related BookingLines in
a portal. All well so far. But if the individual costs in a
BookingLine change in the portal, the value in TotalBookingCost is not
updated.

It seems I can force a refresh by a variety of means, such as toggling
the Status Area off and on, switching to a different layout, etc., but
I'm sure I shouldn't have to. Any ideas what I'm doing wrong?

(FM9, PC)

Carla
.

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