Fixed selling plan prevents items being added to the order

Shopify Apps

Topic summary

A technical limitation prevents merchants from adding products to orders that contain items with fixed selling plans (commonly used for try-before-you-buy and pre-order scenarios). When attempting to add items, Shopify displays an error message blocking the action.

Key impacts:

  • Admins cannot modify orders when customers request changes
  • Out-of-stock items cannot be swapped for different sizes or styles
  • Shopify’s new exchange features are unusable for these order types

Workaround attempt:
One user suggested removing the problematic item, updating the order, then adding the new item. This solution worked for some participants but failed for others, particularly those using pre-order selling plans.

Status: The issue remains unresolved with no official fix announced. Multiple merchants are requesting Shopify address this long-standing restriction that significantly limits order management flexibility.

Summarized with AI on October 30. AI used: claude-sonnet-4-5-20250929.
1

When a selling plan with a fixed pricing plan exists on an order, no products are allowed to be added to it.

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If you try to add a product (not a custom product) to an order containing any item with a fixed selling plan you get the error: “You cannot add items to this order because it contains an item with a fixed selling plan.”

This limitation has existed for as long as selling plans have been available but it’s a huge restriction that limits the flexibility of try before you buy orders (and any other order flow that uses fixed selling plans).

  • Admins can’t edit orders when a customer requests changes or makes a mistake
  • If an item is out of stock, it can’t be swapped for a different size or style
  • The new exchanges features that Shopify has rolled out can’t be utilised for the same reason, despite try before you buy orders being one of the most obvious use cases for this functionality

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Are there any plans to support this for orders with fixed selling plans?

2 Likes
2

Having this same issue, customer pre-order items , she wanted a bigger size in one of the items and now it’s not editing at all. Please advise this fix.

Fixed selling plan issue for preorder
Fixed selling plan issue for preorder757×360 17.1 KB

3

Please fix this! I don’t even understand why this is an issue. I just want to edit an order per customer request. Extremely frustrating.

4

I had the same problem. Here’s what I did.

Remove the item that is incorrect. For me it was a pre-ordered item.
Update the order.
Add the new item.
Let me know if this works for you.

2 Likes
5

Thankyou! this worked for me also

6

this did not work for me :disappointed_face:

I’m using a pre-order selling plan. Urgh…