Invoice is not getting associated with the Trade Operation for actual cost determination

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Gurus,

We are trying to run a scenario where we do not want to put estimate charges, upfront; but the client needs to directly allocate actual freight charges when the invoices arrive. To accomplish this, I setup the following scenario, where the Trade Operation had $0 for estimated cost, and was created just before the invoice is received.

We have created and received the material PO before the TO is setup. Here is the sequence of events in detail:

1. We created a material PO and received it.
2. Then created a Traded Operation with $0 as estimated cost. Completed allocating this $0 on the TO.