Hi,
Out of box, if there's an error here it'll automatically be captured in the system log.
However, based on what you're doing with GlideRecord, this may not throw an error and instead it'll create a record (because you didn't format this correctly to successfully query the table and are trying to "update" nothing...so a new record would be created).
You can insert your own logging though by using example:
(function executeRule(current, previous /*null when async*/ ) {
gs.info("***DEBUG - Hi I'm at the start of this script");
var grL = new GlideRecord('u_leiekategori');
var a = current.u_maanedspris;
gs.info("***DEBUG - This is the value set for JavaScript variable 'a': " + a);
grL.u_gjeldene_leiepris = a;
grL.update();
gs.info("***DEBUG - Bye!");
})(current, previous);
So the above shows 3 places I'm logging things.
Otherwise, you may want to review using a try catch: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch
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Please consider marking my reply as Helpful and/or Accept Solution, if applicable. Thanks!
