Entering Fixed Assets via AP module is the preferred option as the System Clearing – Fixed Assets account would be cleared automatically by overnight batch.
If you have to capitalize an invoice as an asset and the invoice has already posted as an expense, manual data entry in AM module would be the preferred option. Once the asset created and the overnight batch completed, you will need to clear the System Clearing – Fixed Assets manually in the ledger.
Any manual data entry on Asset creation in AM module, manual journal will require to clear the System Clearing – Fixed Assets.