An incorrect weighting procedure has been allocated to the weighting key

What causes this issue?

According to table TE266, a specific weighting procedure has been
assigned to the weighting key entered.

System Response

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

How to fix this error?

You may only enter one weighting key that has been assigned the
weighting procedure '05' (see table TE265).

Error message extract from SAP system. Copyright SAP SE.