Percent field &1 is attached to a schema &2 and version &3 for A/D &4

What causes this issue?

An assignment of calculation type as <LS>Value</> to an Addition and
Deduction procedure is incorrect.

System Response

You cannot change calculation type as <LS>Value</> to an Addition and
Deduction procedure. Any of the percentage field (ZAP01 to ZAP05) is
attached to an Addition and Deduction.

How to fix this error?

Check the Technical Assignment to Field (ZAP01 to ZAP05) for Addition
and Deduction procedure.
Check customizing: IMG->Sales & Destruction->Bill of
service->Cost Determination for Bill of Services->Easy cost
planning->Define Additions and Deduction procedures

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.