Hi,

In Odoo 18, decimal precision is controlled globally, so if you set 10 decimal places for quantities to keep BOMs accurate, those same decimals will also appear on delivery notes and other documents. By default, Odoo doesn’t allow different decimal settings for the same field in different contexts.

The simplest way to handle this is to keep the global precision at 10 but adjust the delivery note report template so quantities are formatted to show only 2 or 3 decimals. This way, internal calculations remain precise, while customer-facing documents stay clean.

A more advanced option is to create a custom decimal precision group specifically for BOM fields and leave the default unit of measure precision at 2–3 decimals for delivery and picking documents. However, this requires customization, whereas formatting the delivery note output is usually the safest and easiest solution.

Hope it helps