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ZAMEEL ISMAIL

Hi,

I'm using Odoo 18 and facing issues in the POS module:

  • Some orders can't be validated.
  • Some orders can't be printed.

It happens randomly — some orders work fine, others don't. I'm using POS in chrome.

I've tried clearing the POS cache, checking browser console and server logs, but couldn't find a clear cause.

Has anyone else faced this?

Any ideas on what could be wrong — config issue or a possible bug?

Thanks!

 

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ZAMEEL ISMAIL
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Hi Dhrumi,

I followed the suggested steps, but I’m still facing the same issue:

  • Validation fails for some orders.
  • Printing does not work consistently.

Additional info:

  • No IoT Box/POSBox (direct browser printing).
  • Odoo 18 Community deployed on AWS EC2 with a custom domain.
  • I checked the browser Console (F12) — I can see some JavaScript errors during validation/printing.
  • No custom modules affecting POS.

It seems like a frontend or server communication issue.

Any suggestions on how to fix this or anyone else facing similar issues in Odoo 18 POS?

Thanks!

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Dhrumi (Wan Buffer Services)
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Check for Common Causes

These issues are often linked to:

  • Missing or incorrect printer configuration
  • Problems with network or proxy setup
  • Issues with the POSBox or IoT Box
  • JavaScript errors in the browser (since POS runs in a web interface)
  • Misconfigured receipt templates

Confirm POS Printer Setup

  • If you’re using POSBox or IoT Box:
    • Make sure the device is connected and turned on
    • Check if the browser can communicate with it
    • Test with the POS IoT diagnostic tool in Odoo

 You can test by:

  • Going to Point of Sale > Configuration > IoT Boxes
  • Click on your IoT Box and test the printer connection

Enable Auto-Print (if needed)

  • Make sure "Automatically Print Receipt" is enabled in your POS settings.

Path:

  • Go to Point of Sale > Configuration > Point of Sale
  • Select your POS session config
  • Scroll to the Bills & Receipts section
  • Check the box for Auto Print

Inspect Receipt Template

  • The receipt layout might be broken or have syntax errors.
  • Check the custom receipt template (if you're using one) for any issues.

Use Developer Tools in Browser

  • Open the POS in a browser
  • Use F12 (Developer Tools) to view the Console tab
  • Look for JavaScript errors when trying to validate or print
  • This helps you identify if there’s a frontend issue

Check for Module Conflicts or Custom Code

  • If you have installed custom POS modules or made changes to the JS, XML, or Python files related to POS:
    • Temporarily disable them and test again
    • Conflicts in overrides can break the print or validation flow

Restart & Update

  • Restart your Odoo server and browser
  • If using a deployed version, clear the browser cache
  • Make sure you're using the latest build of Odoo 18 with all patches

Test the Workflow

  • Open a new POS session
  • Make a test transaction
  • Validate the payment and check if the receipt prints automatically


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