Add amount_due to aged_partner_balance
CHANGELOG:
### ADDED
- [#573](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/573) Add amount_due to aged_partner_balance
Edited by Pelayo García
CHANGELOG:
### ADDED
- [#573](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/573) Add amount_due to aged_partner_balance