This idea has been merged into another idea. To comment or vote on this idea, please visit S1-I-973 Print remittance without posting payment.
At the moment if you try and print remittance on a payment which has the message 'you can't edit this transaction as there is an associated payment or refund' you can't do it. The only way around it is to unallocate but even then, you'd not have the invoice details on there as it's not allocated.