While I will do it, i'm not sure if this is what you want. If I understand correctly, some process gets triggered and then writes some values to the ODB, then the sequencer 
should continue. Putting a wait there is dangerous. Maybe your process always takes like 10-20 ms, so you put a wait of let's say 100ms, and things are fine with you. Your 
script runs many days, but then once in a while your machine is on heavy load because someone starts a web browser, and your process takes 110ms, and you script crashes.

I would rather go following path: put a "done" flag in the ODB, which is the last one which gets set by your process. Then the sequencer does a 

WAIT ODBvalue, /path/value, =, 1

which will work always, independend of the delay of your process.

Stefan