Signature verification failed , but the all the references are being validated successfully

Hi Team,

I can see mendelson logs saying validation of all the references in the incoming messages are validated successfully. But it also says "SOAP Signature validation [failed]".
Does it mean mendelson is also checking for signature of something for which the signature element does not have reference to ? can you please help me understand the meaning.

[9:27:24 AM] mendelson-opensource-AS4-180425092723-171@172|0AE329A4162FBB318D20000016C15720@8712423010208: [Signature verification processor] SOAP Signature validation [failed]
[9:27:24 AM] mendelson-opensource-AS4-180425092723-171@172|0AE329A4162FBB318D20000016C15720@8712423010208: [Signature verification processor] Reference "#id-def003b6-5881-4532-9217-1e151eb2ae71" signature validation [success]
[9:27:24 AM] mendelson-opensource-AS4-180425092723-171@172|0AE329A4162FBB318D20000016C15720@8712423010208: [Signature verification processor] Reference "#id-417f5d9a-6228-4b95-875a-203c27fd4f17" signature validation [success]
[9:27:24 AM] mendelson-opensource-AS4-180425092723-171@172|0AE329A4162FBB318D20000016C15720@8712423010208: [Signature verification processor] Reference "cid:0AE329A4162FBB318D80000016C15730" signature validation [success]

Foren
AS4

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