Discrepancies in document data for rebate arrangement &

What causes this issue?

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

System Response

How to fix this error?

Note the following list output. All differences are highlighted in
color. Please look into this matter.
If necessary, contact your system administrator. Such a situation
usually necessitates data and/or program corrections.

Error message extract from SAP system. Copyright SAP SE.