Item & of purchasing document & does not exist in system

What causes this issue?

Purchasing document &V2&, item &V1&, is relevant for the business
volume update of a condition record of rebate arrangement &V4&.
However, item &V1& of purchasing document &V2& does not exist in the
system.

System Response

Purchasing document &V2&, item &V1&, cannot be taken into account in
the relevant function (detailed statement, recompilation of statistics,
etc.). The data generated is thus incomplete or faulty.

How to fix this error?

For correct business volume data, purchasing document &V2&, item &V1&
must be available in the system.
Possible causes:

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

Hardware or software error
Internal program error (document item not imported to internal buffer)
If necessary, contact your system administrator.
The affected condition record has the (internal) number &V3& and
belongs to rebate arrangement &V4&.

Error message extract from SAP system. Copyright SAP SE.