Solution : https://service.sap.com/sap/support/notes/1577082 (SAP Service marketplace login required)
Key words :
' couldnot set enqueue-lock 'sntxxhmac_krnenq ', work process trace, prerequisites error handling, error message, error => locfunc_enqueset, upgrade terminates, phase parconf_upg, terms hmac, internal rfc, secstore reason
Related Notes :
| 1390477 | Additional info about the upgrade to SAP NetWeaver 7.3 |