You need a refresh. Either use a calc on the parent side with the sum () function instead of your summary, or if you have 10, you can use a script trigger to refresh when you leave a field.
I am running FM 10 Advanced on OSX
I am not sure what 'refresh' command you mean??? I have implemented this script trigger script:
goto field [sumtotal]
Where sumtotal is outisde the portal but in the header of the layout.
This script does nothing. I still have to click into the field and then out again to get it to update?