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How do you autopopulate a related field in custom module from a related field of another module?

Question asked by luthien luthien on Jun 23, 2014
Latest reply on Jun 22, 2015 by Francesca Shiekh
I'm fighting against this issue since a couple of weeks and I can't figure out a way to do that.

I have a custom module for the orders management and I need to produce invoices automatically.
I'm following the example of 'ConverToInvoice.php' from Quotes module so, if I click on that button (under the Edit button in Detail View) I should create a new Invoice whose fields are pre-filled and  editable.
I have to grab fields' values from current order management.
My first problem is that a lot of those fields are related, too.

For example, I need to fill a related field called 'Suppliers' in my invoice. The value I need comes from a module (Suppliers) related to the Account, which is related to the current order management.

How can I easily grab that value and put it in my suppliers field?

I tryed to follow this guide  but it didn't worked.. probably I miss something.
I really need help, as soon as possible.

Thank you.