Do 1 PO invoice and 2 PO debit notes

If I do the PO invoice for the partial amount, the system will change the cost of the item received.

e.g. Item cost is 5000 when received.

If I do an invoice for 1000, it will create a -4000 adjustment to the item, reducing its cost.

When I do the 2 PO debit notes (for 2000 each), it does add back 4000 to the item cost.

But the three invoices are received at different dates (usually a month or more apart), the cost of the item will be incorrect till all the invoices are entered.

I am thinking that maybe enter a PO invoice for the whole amount and then enter a credit note in AP and then enter the remaining invoices as AP invoices.

If I do the PO invoice for the partial amount, the system will change the cost of the item received.

e.g. Item cost is 5000 when received.

If I do an invoice for 1000, it will create a -4000 adjustment to the item, reducing its cost.

When I do the 2 PO debit notes (for 2000 each), it does add back 4000 to the item cost.

But the three invoices are received at different dates (usually a month or more apart), the cost of the item will be incorrect till all the invoices are entered.

I am thinking that maybe enter a PO invoice for the whole amount and then enter a credit note in AP and then enter the remaining invoices as AP invoices.

That will work.