# Fishbowl: "Unit cost must be at least 0."

> You entered a negative unit cost, which inventory costing doesn't allow.

## What it means

Fishbowl won't accept a negative unit cost. In inventory costing, this field records what you paid per unit. A negative number would imply a credit or rebate, which doesn't fit standard cost accounting and violates the validation rule.

## What to check

- The value you entered: verify there's no minus sign. Re-enter it as a positive number or zero.
- Decimal separator: confirm you used the correct separator (period vs. comma) for your locale.
- Copy-pasted data: if you imported this value, check the source to confirm it's not accidentally negative.
- Whether zero is acceptable: if the system requires a cost, enter a positive value; if cost is optional, check whether leaving it empty is allowed instead.

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*From Israel Lopez Consulting (ILC). Custom Fishbowl Inventory integrations and software, and Fishbowl experts since 2015. Written by Israel Lopez. Questions about this topic, or want to reach the people who wrote it? Visit https://israellopezconsulting.com/contact*