No update yet effected for purchasing document &1, item &2

What causes this issue?

No business volume data updated for purchasing document &V1&, item &V2&
as yet.

System Response

No business volume data was determined for this document. It is possible
that a follow-on function, required for correct business volume data for
the condition record, has not been carried out.

How to fix this error?

It is likely that no goods receipts or incoming invoices exist for
purchasing document &V1&, item &V2&.
You can establish whether or not goo ds receipts or incoming invoices
have been recorded by reference to the PO history. The list output of
the <LS>Detailed statement</> function includes a message for each
invoice receipt for which the supplementary supplier business volume
update has not taken place.
Be sure to note that the supplier business volumes relevant to rebate
settlement currently included in the statistics are incorrect. If you
now carry out (or have already carried out) settlement accounting with
for the affected condition record, the results of this process may be
incorrect. It is therefore essential that you check the results of any
settlement accounting already performed.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

You can correct the results of a faulty settlement accounting process by
repeating it (if necessary, cancel the settlement document).
If an interim settlement is involved, the relevant business volumes will
be taken into account in the next settlement.
If the rebate arrangement provides for periodic partial settlement and
provision has been made for final settlement to be effected on the basis
of the total business volume (see Customizing for the rebate arrangement
type), the difference in business volumes will be taken into account in
this final settlement.
You can allow for such a difference in business volume figures when
carrying out final settlement accounting for the rebate arrangement by
carrying out a prior business volume comparison and agreement process.
The condition record affected has the (internal) number &V4& and belongs
to rebate arrangement &V3&.

Error message extract from SAP system. Copyright SAP SE.