March 4, 2017
Cloning an Opportunity that has Quote Syncing turned on may cause ‘An internal server error has occurred’ type of error. The Salesforce platform gets confused because the new cloned Opportunity has a field that references a Quote on the original Opportunity. The field that holds the record id of the synced Quote will need to be cleared. On the clone configuration, set the ‘SyncedQuoteId’ action to ‘Leave Empty’.