In D365 through the LCS query link below,
https://fix.lcs.dynamics.com/Issue/Details?bugId=427250&dbType=3&qc=d3b45e524bd285606ad680137d5035e0cf71f5f93f7a125773f0029388628f0a

The scenario below does not show the ABN number for the Vendor tax invoice linked to a PO:

When creating a vendor tax invoice (without PO),
system automatically pick up the ABN (Australian Business Number) number. But
when creating a vendor tax invoice based on a PO, system doesn’t pick up ABN
number of vendors. Users have to manually update it.

***[BUSINESS PROCESS] ***

1. Go to AP module or workspace Vendor invoice tax
entry

2. Create a vendor tax invoice without a PO - on the
header you will see the ABN number is displayed.

3. Create another vendor tax invoice but based on a
purchase order the ABN is not displayed on the header

REMARKS
ABN number could be shown when user switches to invoice header view.

Our customer would like to request the same feature to be available for vendor tax invoices from a PO to work the same way as without the PO where the ABN numbers are shown on the lines as well instead of just on the header.