Quittancer

16:15 Nov 15, 2020 

Quittancer does not mean to give someone a receipt:

Quittancer, verbe trans.,dr. civil et comm. Donner quittance de quelque chose (dette, obligation). Quittancer un contrat, une dette, une obligation. Quittancer un mémoire d'ouvrages faits, de marchandises fournies (Ac.). Au passif. Ce mémoire a été quittancé par le tribunal (Besch.1845)
https://www.cnrtl.fr/definition/quittancer

Some sort of documentation or receipt may serve as proof that someone has been "quittancé," sure. But the word means releasing someone from a debt or obligation. A receipt isn't necessary, and may not be sufficient, to do that. The receipt is evidence of the quittance, in both FR and EN. See above for the FR, or Merriam-Webster for US EN:

"Definition of quittance
1a : discharge from a debt or an obligation
b : a document evidencing quittance"
https://www.merriam-webster.com/dictionary/quittance

When people use "quittance" to refer to the piece of paper (receipt etc.), it's a type of metonymy: https://en.wikipedia.org/wiki/Metonymy#Examples

11:48 Nov 14, 2020 

Thank you- that is really clear, and fits in with the text.

00:35 Nov 14, 2020 

is when a debt is owed jointly and severally by more than one debtor.

In that case every debtor owes their own fraction of the total debt but is also guarantor for other co-debtors.

So the lender can recover the whole of the debt from ANY of the co-debtors.

What this decision says is that the fraction of the whole debt that was repaid by other co-debtors (and for which amounts they got "receipt of payment / des quittances") can no longer be claimed from the co-debtor that is being sued.