Comment 4 for bug 1529969

Here is the corresponding log entry indicating error attempting to create a transit (so this appears to come into play on items checking in, having an open transit entry and trying to fill an existing hold):

2018-11-20 16:38:29 app12-prod open-ils.cstore: [ERR :30099:oils_sql.c:2522:zzz] open-ils.cstore ERROR inserting action::transit_copy object using query [INSERT INTO action.transit_copy (copy_status,dest,dest_recv_time,id,persistant_transfer,prev_hop,source,prev_dest,source_send_time,target_copy,cancel_time) VALUES (7,353,DEFAULT,DEFAULT,DEFAULT,DEFAULT,337,DEFAULT,'now',34206506,DEFAULT);]: 41990401 41990401: ERROR: Copy id=34206506 is already in transitCONTEXT: PL/pgSQL function action.copy_transit_is_unique() line 8 at RAISE