We have imported invoices from another system into ODOO with the wrong Journal Entry. Invoices have already an invoice number. 

I have set the invoices to draft and tried to modify the Journal with the export / import functionality. I got an error message that i cannot modify the invoices that have already an number (You cannot edit the journal of an account move if it already has a sequence number assigned.) 

When i modify the invoice manually, i can change the Journal item (and it assigns a new number).

I have two questions:
1) Is there a work-around to modify the Journal and still keep the same invoice number ?

2) If 1) not possible, is there a way in bulk modify the Journal and assign a new number ? 

Thanks,

Dan