You cannot set the "Configurable material" indicator for this material

What causes this issue?

In the master record, you have flagged the material as a configurable
material, the material being assigned to a material type other than
"configurable material".
However, this indicator is not possible here since a configurable
material has already been assigned to the material in at least one
plant.

System Response

The system cancels your entry.

How to fix this error?

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.