Losing third party certificate after changing cryptography settings

[ale137]

Hi, im adding a third party CA to my enviroment. I can import it just fine, but after changing any setting in IBM Cognos Configuration the certificate dissapears from the CAMKeystore and is replaced by the self-signed from Cognos CA/CAMUSER.
Im following this steps:
https://www.ibm.com/support/pages/how-add-3rd-party-ca-allow-ssl-between-components-ibm-cognos-analytics-11

I have to use a root and intermediate certificate.

Anyones knows what may be happening?
Is it right to remove the CAMKeystore from the cert folder before making the certificate request?