Dê uma olhada nas notas...
0001524196 Import certificates in ABAP and Java
0001866334 CL_SEC_SXML_DSIGNATURE: Inclusive C14N
0001885437 CL_SEC_SXML_DIGNATURE=>embed_signature throws error
0001904275 DigestValue tag in NFE does not match with SEFAZ
0001909211 CL_SEC_SXML_SIGNATURE: Error in EMBED_SIGNATURE
Abraço
Eduardo Chagas