Equivalence mode is active for this model

What causes this issue?

You switched on the equivalence number mode for this model.

System Response

Changes were taken over.

How to fix this error?

The program holds both equivalence numbers and amounts for an account
assignment model. The mode selected when the model is maintained is
also made available for document entry.
The equivalence number mode is now active. Check the equivalence
numbers in the items.

Error message extract from SAP system. Copyright SAP SE.