Price too low (below tolerance limit of & %)

What causes this issue?

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

System Response

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

How to fix this error?

Check your entries are correct and make any necessary changes.
Copied from 085; adapted for returns

Error message extract from SAP system. Copyright SAP SE.