Error with Pro Forma

Hello,

I would like to ask for help with an error I am having when trying to generate a pro forma footnote. I am using Ax 2009 and follow the following path:

*** I’m in Brazil, so the screens will be in Portuguese ***

Purchasing / Receiving > Details of the Purchase Order;

I select my purchase order and click on ‘Pro forma’, select ‘Invoice’;

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At the launch of the invoice screen, open the ‘Configuration’ tab and click on ‘Tax Reference’;

On Screen Fiscal Reference ‘, click the’ Invoice 'button;

Following, open the flap and vendor I select the desired record, save and click on ‘OK’ following, and click on ‘OK’ on the other screens to finish the process2402.5.PNG.

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However, the end of the process displays the following error:

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"the update was not specified

updating the purchase order (PO) has been canceled"

Am I missing some procedure during the process? What am I doing wrong?

Thanks for the help!

Please choose Print Invoice befor click OK

i know this is since 2014 but No one answered