In-Transit Accounting

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There is a business requirement to generate in-transit goods entry for below scenario
Whenever goods are shipped from supplier site, business receives invoice and it has to create liability for the invoice (though goods are still in transit).
So in such scenario business wants in-transit account debited and liability credited.
And then when goods are actually received, there should be accrual account debited and in-transit account credited
Above both events should generate entries in payables module only.
(This is particularly relevant in case of transactions near month end)

Please let us know how can we achieve this?

Can we create custom event type with conditions to occur only for PO matched invoice. (Like for payment creation and payment reconciliation separate entries are generated)