importer: postings with price & cost

[nug get]

Dear all
i am struggeling with importing stock trades, with the cost & price. Can 
you help me?

here is where I am so far:

            postings=[
                    data.Posting(Account,
                        quantity, None, price, None, None),

results in a postings 
 Assets:Invest:IB:VXUS:VXUS         1 VXUS @ 38.29 USD

and
            cost=position.Cost(price,currency,None,'mylabel')
            postings=[
                    data.Posting(Account,
                        quantity, cost, None, None, None),
results in   
Assets:Invest:IB:VXUS:VXUS         1 VXUS {"mylabel"}

how do I have to modify those lines such that i get the format as in the 
documentation, with cost (and, on selling, the price and cost) correctly as 
in the documentaion:
Assets:ETrade:IVV                10 IVV {183.07 USD}
or, on selling, like 
Assets:ETrade:IVV               -10 IVV {183.07 USD} @ 197.90 USD

Thanks!

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