# Fishbowl: "Drop Ship items can't be modified" — PO already issued

> A sales order line item for a drop-ship product is locked because the purchase order sent to the vendor has already been issued.

## What triggers it

You're trying to change a drop-ship line item in a sales order (usually the quantity). The purchase order that Fishbowl automatically created and linked to that sale has already been issued to the vendor.

## Why Fishbowl blocks it

A drop-ship purchase order is a direct instruction to your vendor. Once issued, changes to the linked sales order line would create a mismatch: your vendor is fulfilling based on the PO they received, but your internal sales order now says something different. Fishbowl locks the SO line to prevent this synchronization break.

## What to do

Try to unissue the purchase order to revert it to draft status. Once you do, edit the SO line to the correct quantity or details, then re-issue the PO. If the PO is locked and can't be unissued, contact your Fishbowl administrator—some workflows enforce read-only POs after issue. If that's your situation, cancel the current SO, create a new one with the correct details and quantity, and issue a fresh purchase order to the vendor.

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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*