Price too high (tolerance limit of & & exceeded)

What causes this issue?

The price (value of the credit memo divided by the quantity) varies too
greatly from the net order price.
INCLUDE MM_IV_MELDUNGEN OBJECT DOKU ID TX

System Response

The system has found that the value of the credit memo exceeds the
expected value (credit memo quantity x net order price) by more than
the tolerance for price variance set in Customizing (&V1& &V2&).

How to fix this error?

Check your entries are correct and make any necessary changes. If you
post the document in spite of the variance, the system makes the
posting and the relevant account movements. The document is not
blocked.
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Error message extract from SAP system. Copyright SAP SE.