# Fishbowl: "Cannot change UOM on open orders"

> A product's unit of measure cannot be changed while orders for that product remain open.

## What it means

The UOM change is blocked because Fishbowl detected open orders for this product. Changing the UOM while orders are in flight can break order fulfillment logic and inventory calculations tied to the original unit.

## What to check

- **Search for open orders on this part.** Look in sales orders and purchase orders for any non-completed records referencing this product.
- **Ship or close those orders.** Complete fulfillment, receive stock, or formally cancel the open orders before retrying the UOM change.
- **Consider a new SKU instead.** If you need a permanent UOM change and have frequent orders, creating a separate part with the new UOM may be safer than modifying the existing one.

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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*