Hi, i had many experiences with Odoo, with Odoo 8 too.
I have created many custom modules. Your error is because of a false sql statement. But to know where and how, i must see it. I can fix it today
Relevante Fähigkeiten und Erfahrungen
Senior Python / Java developer with more than 2 years experiences with Odoo (ver. 8,9,10)
Vorgeschlagene Milestones
€152 EUR - Remove the bug, so that you can generate the trial balance
€70 EUR - Check the module again and write for you a documentation, why it is happen
Zusätzliche Dienstleistungen angeboten
€1 EUR - Custom module