Hello Juan

Popup would have conditions field and value of condition based on field defined with 'change_default' = True. if change_default set true on any field then those field will be visible on condition value.

let's take an example 

move_type = fields.Selection(selection=[
('entry', 'Journal Entry'),
('out_invoice', 'Customer Invoice'),
('out_refund', 'Customer Credit Note'),
('in_invoice', 'Vendor Bill'),
('in_refund', 'Vendor Credit Note'),
('out_receipt', 'Sales Receipt'),
('in_receipt', 'Purchase Receipt'),
], string='Type', required=True, store=True, index=True, readonly=True, tracking=True,
default="entry", change_default=True)

now above account.move object has field move_type with change_default=True so this field will be visible on popup for condition field. 

Below example says payement reference set  "123" as default only if move_type is customer invoice.

Thanks & Regards,

​

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