Hello, is anyone aware of any documentation when the foreign currency reclassification journal entries will trigger? Is it based upon revenue recognition journals and/or billing events?

These two - FX and reclassification - are different. FX is triggered when the currency on transaction date and currency on the rev JE date are different. Reclass is triggered when there is no AR booked (revenue only) at the time of JE so that it is CR AR and DR Unbilled Receivables.

@Karina So if the revenue plan has a different rate than the revenue recognition je will that trigger a foreign reclassification event? Even though the plan is converted to USD.

The plan uses the day-of-creation rate, and month end journal uses last day of the month rate. You have the variance between the two. And btw it is called "foreign currency adjustment"

would there be an unbilled receiveable adjustment and a foreign currency adjustment for foreign currency transactions?

if you did not invoice your customer by the end of the period - yes, you will have reclassification journal. it is not related to the FX journal. This journal is related specifically to billing. the FX adjustment journal is not related in any way to the reclass journal, it may or may not happen depending on the currency of the sale vs base currency (same currency does not produce FX adjustment journal)

just so I understand. the fx revaluations will happen based upon the revenue recognition je's, the billing events and unbilled receivable?

Let me try to be very clear. There are three potential journals created when you process the second ("reclassification") revenue journal: