SAP Message BOS04076 - Percent field not allowed; calculation rule is fixed portion for A/D &1

Diagnosis An assignment of Addition and Deduction procedure is incorrect. System Response You cannot attach any of the percentage field (ZAP01 to ZAP05) to anAddition and Deduction for which calculation type is Fixed portion . Procedure Check the calculation rule assignment of the selected Addition andDeduction procedure. You have selected calculation rule as Fixedportion and trying to attach percentage field (ZAP01 to ZAP05). Check customizing: IMG->Sales & Destruction->Bill ofservice->Cost Determination for Bill of Services->Easy costplanning->Define Additions and Deduction.