Pinned topic addPerson giving error in MDM10 with SDP with Probabilistic Matching ON

I have executed addPerson transaction and after successful run I found the entry in EME_RECCMPD table for the data i have added.

After that I have just chnged the Last_name and executed addPerson again and then I am getting the following error:
Error_Shared_Execute: Error occurred when executing the following business rule. Rule = com.dwl.tcrm.externalrule.A1SuspectsActionRule; additional error message = http://4405 DIERR 49248 Matching adapter execution failed.
O ERROR - com.dwl.tcrm.exception.TCRMReadException: http://4405 DIERR 49248 Matching adapter execution failed.
at com.ibm.mdm.eme.party.EMEPartyMatcher.matchParties(EMEPartyMatcher.java:109)
at com.dwl.tcrm.externalrule.A1SuspectsActionRule.createSuspectsForBestA1Match(A1SuspectsActionRule.java:493)

If I turn the SDP OFF then addPerson is not giving any error. After that I have executed createSuspects and the Suspect table got populated as exepected. But I can't understand why addPerson is failing if SDP is turned on. I have tried changing the DOB, LastName, Ref_Num etc. Then also I was facing the same problem. Please help.