I am facing an issue with Process Loss configuration in a BOM.
The Stock UOM of the production item is set to “Nos” (whole number).
When I enter a Process Loss Percentage (for example 6.5%),
ERPNext automatically calculates the Process Loss Qty as a fractional value
(e.g. 208.975) and shows the following error:
“Nos can’t have fractional process loss qty as UOM Nos is a whole Number.”
Since the Process Loss Item and Process Loss Qty are read-only and auto-calculated
from the percentage, there is no way to manually round or adjust the value.
What is the recommended or standard approach in ERPNext for handling process loss
for count-based items (Stock UOM = Nos)?
Is changing the Stock UOM or avoiding Process Loss and using Scrap instead the only solution?
Any guidance or best practice would be appreciated.
Each Float or Currency fields are programmed to record precision to a 9 level. These precisions can be controlled from system setting doctype globally. On the other hand, Process Loss Qty field type is float against which precision can be set to Zero by customizing the stock entry doctype particularly.
Process Loss in ERPNext is conceptually meant for measurable / continuous quantities.
For items with Stock UOM = Nos, loss is inherently discrete, not percentage-based.
Because of this, fractional loss is logically invalid and ERPNext blocks it by design.
It’s best to treat process loss and count-based rejection as different concepts and align BOM design accordingly, rather than forcing percentages on whole-number items.
