As soon as i change status 'sent' to viewed' error: The Invoice # field must contain a unique value

I have been using InvoicePlane for quite sometime now and no issues been occured so far until yesterday when I tried to change from Sent status Invoice to Viewed, after hit Save button it gave me this error.

Can someone help on this?.

Thank you for the screenshots, they give an idea of what's going on. Try to do the following:

• Go to the Chrome Dev Tools, go to the Console tab.
• do the exact same steps as you did, right before you got the error
• when the error comes, check out the console tab, make a screenshot of it
• go to the network tab, does it show anything?
• on the console tab, can you click on anything, that shows your error on the network tab?

@nielsdrost7 nothing return on console tabs, on network tab only shows some informations like so;

I attached har files as well just in case it helps. invoice.azmi.my.har-01.har.tar.gz

Great job with the screenshot

Ok, turn on debug mode in ipconfig.php and then do the same steps. Click on that link that ends with ajax I think you can also click to open it in a new window.

It should show some kind of SQL query

@azmidotmy awaiting those screenshots

@nielsdrost7 , I had turned on debug mode but I dont see SQL query when I clicked mentioned ajax linked.

I clicked other tabs as well but I dont see SQL queries. Anything that I did wrong?.

@azmidotmy can you click on 'response' and make a screenshot of that?

@nielsdrost7 , sorry for delayed response. I cant screenshot caused it doesnt wrap up whole syntax so I pasted it here.

{"success":0,"validation_errors":{"invoice_number":"<p>The Invoice # field must contain a unique value.<\/p>"}}

@azmidotmy sorry, but I cannot reproduce this problem. Right now we're working on version 1.6.1 and whatever I do, I don't get the error

I know exactly in which code to look. It's function validation_rules_save_invoice on Mdl_invoices.php (line 136) But for me, it doesn't go wrong.

Once version 1.6.1 comes out, would you mind trying it again?