Hi:

If I create a Bill from a request for quotation, the Bank Account field appears empty, even though the vendor has a bank account defined. But I create the bill directly from the Bill form the Bank Account field shows the value of the vendor´s bank account.   

Here the fields and object related to this operation:

field: invoice_partner_bank_id

Object: account.move

Relation: res.partner.bank

Thank you in advance