FTPS - Peer certificate rejected by ChainVerifier

hello everybody,

i'm working with a sap PI 7.1

I need create a FTPS-PI-SAP interface.

I have uploaded the certificate (provided by 3party FTP partner) in NWA under trusted TrustedCAs and status of certificate is green.

I created Communication Channel like described here:

http://scn.sap.com/people/rajasekhar.reddy14/blog/2010/04/13/how-to-configure-ftps-in-file-adapter

but i still to have error:

iaik.security.ssl.SSLCertificateException: Peer certificate rejected by ChainVerifier

any suggestion?

the problems is in the certificate?

Alex