When user use a service item that is set to be received in the account 600180, but in the purchase order line details, changed the accounting distributions into the different ledger account which is110110.

When posted the product receipt, why do the system still use ledger account 600180 not the one that in the accounting distributions we updated? But if posted the PO invoice, we can get the current leger account in accounting distribution and voucher, which is 110110 we updated on PO line details manually. The LCS link is: Details for issue 719124 (dynamics.com)