Settlement data from user exit includes invalid data records

What causes this issue?

The settlement data taken from a user exit at plant level includes data
even though settlement accounting is not carried out at plant level
(settlement type) or includes data stemming from other condition
records. This is not allowed.

System Response

Settlement accounting with regard to the condition record, and thus for
rebate arrangement &V3&, is not possible.

How to fix this error?

The programming in enhancement LWBON003, function module
EXIT_SAPLWN01_003, of function group XWNX must be changed.
The above data may not be included in structure
T_SETTLEMENT_VALUES_MWSKZ.
If necessary, please contact the person responsible in your enterprise.
The affected condition record has the (internal) number &V1&, item
number &V2&.

Error message extract from SAP system. Copyright SAP SE.