3757411 - Error "direct posting to tax account not permitted" when posting supplier invoice with purchase order reference

When posting a supplier invoice with a purchase order reference, the system raises an error: "Direct posting to tax account is not permitted."

The issue reproduces during simulation in the Create Supplier Invoice app.

SAP S/4HANA Cloud Public Edition

1. Open the Create Supplier Invoice app.
2. Enter and reference an existing purchase order.
3. Run Simulate.
4. Observe the error "Direct posting to tax account is not permitted."

It is not possible to post to a tax G/L account when that tax account is assigned in the purchase order account assignment. For PO-referenced invoices, direct postings to tax accounts are blocked by design.

Do not assign a tax G/L account in the purchase order account assignment. Use a non-tax G/L account for PO items; tax is posted automatically based on the tax code.

If a separate tax line must be posted directly to a tax G/L, post it as a direct G/L line in the G/L Account tab (non-PO-based) of the Create Supplier Invoice app. Direct posting to a tax account is not allowed via the PO reference.

2808805 - MIRO: error M8890 - Direct posting to tax account not possible

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