Enter goods receipt data only when working with GR-based IV

What causes this issue?

<ZH>Goods receipt-based invoice verification:</>
In row &V1& of table <LS>Itemdata</> for purchase order &V2&,item &V&,
you have completed one of the following fields incorrectly or not at
all:
REF_DOC (Reference document number)
REF_DOC_YEAR (Fiscal year of the current period)
REF_DOC_ITEM (Reference document item)
If you are working with goods receipt-based invoice verification, you
must complete these fields. They uniquely describe the goods receipt
document to which the invoice refers.
<ZH>No goods receipt-based invoice verification:</>
In row &V1& of table <LS>Itemdata</> for purchase order &V2&,item &V3&,
you have completed at least one of the following fields:
REF_DOC (Reference document number)
REF_DOC_YEAR (Fiscal year of the current period)
REF_DOC_ITEM (Reference document item)
If you are not working with goods receipt-based invoice verification,
you must leave these fields blank.

How to fix this error?

In table <LS>Itemdata</>, check your entries in the fields listed
above.

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

System Response

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.