"Http 400 Bad Request" in OAC0 during exchange of cerftificate

Dears,

I'm trying to exchange the certificate from OAC0 to an Http repository just defined on an external Document Management system.

Despite the connection test is ok, the exchange of the certificate continue to fail with the message :

"HTTP error 400: Bad Reques Document creation failed"

I check note 848406, did not solve the problem.

I suspect there is some problem within my Sap system , and in conseguence the certificate is considered wrong or non completed by HTTP server of the external Document Management System.

It ould be the PSE of my Sap system ?

It seems Ok, but how I can verify it ?

Any advise ?

regards