mendelson opensource AS4 certificate issue

Hi,
I am trying to establish a communication link with partner and get following error

mendelson-opensource-AS4-170824162201-3802877@3802878: [Inbound data processing] A problem occured during processing of inbound AS4 data (Module Processing, FailedAuthentication: EBMS:0101 [The certificate with the issuer "C=US, O=Entrust, Inc., OU=See www.entrust.net/legal-terms, OU=(c) 2012 Entrust, Inc. - for authorized use only, CN=Entrust Certification Authority - L1K" and the serial "1356075869 (dec), 50d4135d (hex)" is requested but does not exist in the system ([Security verification], signature verification)])

My partners certificate in Sign/Crypt store is imported as

Issuer: C=US,O=Entrust\, Inc.,OU=See www.entrust.net/legal-terms,OU=(c) 2012 Entrust\, Inc. - for authorized use only,CN=Entrust Certification Authority - L1K
Serial (dec): 1356075869
Serial (hex): 50D4135D

Mendelson opensource AS4 1.0 b21.

What am I doing wrong?

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AS4