Percent field not allowed; calculation rule is fixed portion for A/D &1

Message type: E = Error

Message class: BOS04 - BOS PS integration and Futher objects with EN language

Message number: 076

Message text: Percent field not allowed; calculation rule is fixed portion for A/D &1

What causes this issue?

An assignment of Addition and Deduction procedure is incorrect.

System Response

You cannot attach any of the percentage field (ZAP01 to ZAP05) to an
Addition and Deduction for which calculation type is <LS>Fixed portion
</>.

How to fix this error?

Check the calculation rule assignment of the selected Addition and
Deduction procedure. You have selected calculation rule as <LS>Fixed
portion</> and trying to attach percentage field (ZAP01 to ZAP05).
Check customizing: IMG->Sales & Destruction->Bill of
service->Cost Determination for Bill of Services->Easy cost
planning->Define Additions and Deduction.