Henri, the middle section of the following code fragment shows how you can set those values.
Code:
tell application "OmniFocus" tell front document tell document window 1 set theSelectedItems to selected trees of content set selectedItem to value of item 1 of theSelectedItems -- set next review date to tomorrow set next review date of selectedItem to (current date) + (1 * days) -- set review interval to 3 weeks set reviewInterval to {fixed:true, unit:week, steps:3} set review interval of selectedItem to reviewInterval end tell end tell end tell