We increased the decimal precision for the currency.

We are on odoo.sh

This solves the issue of the line items, but now the tax amount and total amounts also contain 6 digits which is not good.

Hi,

You can increase the number of decimal for a float fields in Odoo by editing the Digits field in Settings > Technical > Database Structure > Decimal Accuracy. But even you change decimal product price field it doesn't reflect on the accounting module because the Tax excl, Tax incl fields are monetary fields. If you want to update decimal digits for those fields then you have to update the source code of Odoo, which is not allowed on Odoo Online edition. If you are using SaaS application then better you raise a support ticket.

Hope this will help you.

Thanks.