def _compute_tracking_number(self): for record in self: record.tracking_number = str((record.session_id.id % 10) * 100 + record.sequence_number % 100).zfill(3)

Based on my understanding of this function when it computes the tracking_number (Order Number), it picks the remainder of the session_id when divided by 10 and multiplies by 100. then adds the remainder of the sequence_number when divided by 100. 

For cases i have witnessed in my orders, 2 orders in the same pos session have a session_id of POS/00107 and sequence_numbers 00120-017-0370 and 00120-021-0170 respecitvely. Now with the function above, the order number is going to be obviously the same for both the orders and this is a problem since i use the customer display. The 2 customers wont be able to tell what order belongs to whom since the order numbers have the same order number.

Can someone tell me how to go about this