Hello Odoo community, I’m encountering an issue while trying to invoice a task in the Odoo Online Field Service module. The error message I receive is: *"Invalid Operation: Cannot create an invoice. No items are available to invoice."* Here’s what I’ve checked so far: The task is marked as completed. The products/services have been delivered. I’ve reviewed the product’s invoicing policy and ensured it's set correctly: *For storable products*: I’m using "Delivered Quantities" or "Ordered Quantiti

This is my product configuration: Product Type: Service Create on Order: Nothing Invoicing Policy: Prepaid/Fixed Price

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Error When Invoicing a Task in Field Service Module: Invalid Operation - No Items Available to Invoice

invoicing FieldService

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RiverCity IT Pros

Hello Odoo community,

I’m encountering an issue while trying to invoice a task in the Odoo Online Field Service module. The error message I receive is:

"Invalid Operation: Cannot create an invoice. No items are available to invoice."

Here’s what I’ve checked so far:

The task is marked as completed.
The products/services have been delivered.
I’ve reviewed the product’s invoicing policy and ensured it's set correctly:
- For storable products: I’m using "Delivered Quantities" or "Ordered Quantities" as needed.
- For services: The invoicing policy is set to Prepaid/Fixed Price.
Additionally, I invoice and pay my employees using two different pay types: Hourly and/or Flat Rate. I want to ensure that this pay structure is being accounted for when invoicing the task.

Despite these settings, I still receive the error when attempting to invoice.

Has anyone encountered a similar issue, or could you provide any suggestions to resolve this?

Thanks in advance for your help!

Manish Bohra

Hello RiverCity,

Kindly, review your product configuration and check the invoice policy.

Based on above validation these is not any product line for invoice.

Thanks.

RiverCity IT Pros

Författare

This is my product configuration:

Product Type: Service
Create on Order: Nothing
Invoicing Policy: Prepaid/Fixed Price

Manish Bohra

okey, let me review bcz it's working fine based on this configuration and have facing the same issue with other product ?

RiverCity IT Pros

Författare

Okay thanks and it won't let me do it with any service not my Service on timesheets or the flat rate one

Marie

Classic issue : this is almost always a product invoicing policy mismatch. Here's the exact fix:

1. Go to **Field Service → Configuration → Settings** and make sure "Timesheets" and/or "Products on Tasks" are enabled under the Invoicing section.

2. Then check the product itself: **Inventory → Products → [your service product]** → Sales tab → make sure "Invoicing Policy" is set to **"Timesheets"** (if billing by time) or **"Based on Delivered Quantity (Manual)"** (if billing by materials/fixed task).

3. On the Field Service task itself, confirm the **Sales Order** is linked (there's a "Sales" smart button at the top). If there's no linked SO, Odoo has nothing to pull invoice lines from.

4. Finally: go to the linked Sales Order → confirm it's in "Sales Order" status (not Draft/Quotation). You can't invoice from a draft SO.

I've configured this for 100+ service businesses — the most common culprit is step 2: someone set the product to "Ordered Quantities" which requires a manually entered delivered qty on the SO line. Switch it to "Timesheets" or set the delivered qty manually on the SO line, then try invoicing again.

If you're still stuck after this, share what version you're on and whether you're using Field Service standalone or tied to a Project module — the flow is slightly different in each case.

I help service businesses automate their operations

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