You can include the code Object.EndCreate(self); after setting the Frac. In Dromed game mode you will get an error message the first time round in each session. I'm not sure if this will leave any data in the background which could cause any other errors.
A slightly safer code is to clone the object:
Code:
SetProperty("CretPose", "Frac", 0.6);
local obID = Object.BeginCreate(self);
Object.EndCreate(obID);
Object.Destroy(self);
This will lose the links of course. For a repeatable setup you could copy the links to/from the clone before destroying the original.