Import GST by MIRO-Subsequentt debit

Dear gurus

In my clident in Malaysia, import GST will be paid by forwarder first to Royal custom,
then will be chareged from forwarder in monthly.

So, when I receive invoice from supplier, I record amount without tax (Tax code=0%).
Then, when I receive invoice from forwarder, I record amount only tax amount
by MIRO:Subsequent Debit.

I'm just wondering in this solution, I have to specify G/L account "Input tax" in MIRO-SD,
them it seems P/O reference will be removed and it is not ideal for us from traceability point of view.

If I don't specify G/L account and specify only PO reference, it goes to PPV automatically,

and it is not ideal.

Is there any solution for it?

Yoshi