trying to import an externally created certificate and key into current SCALE leads to the error message attached.
In the process I noticed that the "CA" field is marked with a star, i.e. flagged as mandatory. This should not be the case for import of a single cert. Anyway the field is deactivated so even if I import the CA cert I cannot select it. Mandatory and deactivated may be the root cause here that leads to the "null not allowed" error.