don't know is this a bug or not. 
*code*
*models/db.py*
db.delivery_header.sale_order_no.show_if = 
(db.delivery_header.delivery_type == 'Sale Order')

*controllers/default.py*
def delivery_form():
    if request.post_vars.delivery_type == 'Sale Order':
        db.delivery_header.stock_transfer_no.requires = 
IS_EMPTY_OR(IS_IN_DB(db(db.stock_transfer_header.status == 'Stock 
Transfer'), 
                                                                            
 db.stock_transfer_header.id, 
                                                                            
 db.stock_transfer_header._format) )
        db.delivery_header.sale_order_no.requires = 
IS_IN_DB(db(db.sale_order_header.status == 'Invoice'), 
                                                                
db.sale_order_header.id, 
                                                                
db.sale_order_header._format)

    if request.post_vars.delivery_type == 'Stock Transfer':
        db.delivery_header.stock_transfer_no.requires = 
IS_IN_DB(db(db.stock_transfer_header.status == 'Stock Transfer'), 
                                                                
 db.stock_transfer_header.id, 
                                                                
 db.stock_transfer_header._format)
        db.delivery_header.sale_order_no.requires = 
IS_EMPTY_OR(IS_IN_DB(db(db.sale_order_header.status == 'Invoice'), 
                                                                            
db.sale_order_header.id, 
                                                                            
db.sale_order_header._format) )

    form = SQLFORM(db.delivery_header)
    """
    cutted
    """
    return dict(form = form)

why the drop down form field is not shown the query 
(db.sale_order_header.status == 'Invoice') as expected in the first place? 
after i submit the form and receive a form error in drop down form field, 
after that the drop down form field is shown the query 
(db.sale_order_header.status == 'Invoice') as expected.

thanks and best regards,
stifan

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