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odoo accounting v14 pos v15
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invoiceerrorprintodoo8.0
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Kevin Sander

Hi at all,

I have a running odoo 8.0 system. At one Sales Order I get the following Error. 

 File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 5320, in ensure_one
    raise except_orm("ValueError", "Expected singleton: %s" % self)
QWebException: "ValueError
Expected singleton: account.invoice.tax(728, 727)" while evaluating
"translate_doc(doc_id, doc_model, 'partner_id.lang', 'account.report_invoice_document')"

I tried to reproduce it but without success, neither I found a solution. 

Does anyone has an idea, how I can solve this and print the Invoice PDF? 


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Mitul Shingala
Beste antwoord

Hello 

you have to add loop on the account_invoice_tax. 

you are getting multiple records instead on single record. that's why this  Expected Singleton error you are getting.

for ex:    <t t-foreach="line.tax_id" t-as="tax_id">
              <span t-field="tax_id.name"/>
           </t>
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Kevin Sander
Auteur Beste antwoord

Hi Mitul, 

thanks for your fast reply. It seems as this should be the solution. But where do I find "account_invoice_tax" to change it? Is it a report or a model or something else?

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Mitul Shingala

into report you can from where error is comes. like into sale order you are made changes and print. at that time you got the error like expected singleton. so check the sale order lines tax value is print on report or not? if print then also check how you print the value or amount on report. ?

Kevin Sander
Auteur

Your workaround helped a lot. Our salesman did the wrong tax entry. The Qweb report couldn't manage two entries and throwed the error. After changing this everything worked as it should.

Thanks for your help!

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