Transfer Invoice Variance to Inventory Valuation program

Dears,

Good Day,

i am use the Transfer Invoice Variance to Inventory Valuation program to transfer the invoice price variance to item cost but the resulted transaction in material transactions 'Average cost update' take the DELIVERY date for this transaction

but in our company the we did not create the invoice at the same of DELIVERY date

so if we have order 10 item and we received each 5 in two receipt the first one on 10/8/2021 and the second on 15/8/2021 then the 'Average cost update' transaction will be generated on 15/08/2021 for the two DELIVERY transaction .

so what we should do in order to make the Average cost update' generated for each DELIVERY date.