Thanks for posting to the Community.
Did you make any progress with your calculation? Please share anything you deem useful here, it might help someone out.
Yes the "Incident Journal" is exactly what I'm looking for (the 2nd topic of this 3-topic video). Thanks for the tip!
Incidentally, I have implemented this in DEV, but for some reason the "Details" attribute of the Incident Journal window is acting as if it's "read only." But I explicitly set it to "read/write" and no change, even to SA. I'm really confused. I have opened a case about this and sent a bunch of screen grabs. So close, but no satisfaction (yet)!
Calculations are always read only attributes.
It wasn't the calculation that was the problem. It was the "Details" attribute on "Incident Journal" (the calculation on Incident named "Incident Journal Details" was working fine - once I changed the attributes to reflect my local instance). It turns out it was just a "broken" window for my "Incident Journal" object. I just made a new one and that worked. Very odd.
Anyway, this is now working great in DEV and I'm going to tweak it a bit and try to add this feature my Analysts have been asking for since January!