3201724 - Upload roles from Back-End Systems to Enterprise Portal failed with error "unexpected lock exception when locking"

After you upload roles from ABAP back-end system into Portal, even the Progress displays as 100% Completed, when checking details about upload result in Log Viewer, you still can see some role objects are marked as Error in "Error Level". So you want to know whether the roles are uploaded successfully or not. See followings as image.

Progress is 100% Completed. 

Status is Finished, but Error Level is marked as "Error".

Also, if download stack trace for the uploaded role, you can see following error from it.
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<com.sap.portal.util.threadreporting.Level>2</com.sap.portal.util.threadreporting.Level>
<com.sap.portal.util.threadreporting.MessageText><![CDATA[Object created: portal_content/com.sap.portal.migrated/<xxx>/roles/<role path>/<role name: aaa>]]</com.sap.portal.util.threadreporting.MessageText>
</Record>
</Record>
<Record>
<com.sap.portal.util.threadreporting.MessageSeverity>SEVERE</com.sap.portal.util.threadreporting.MessageSeverity>
<com.sap.portal.util.threadreporting.Timestamp>1642427621102</com.sap.portal.util.threadreporting.Timestamp>
<com.sap.portal.util.threadreporting.StackTrace><![CDATA[com.sap.portal.pcd.rolemigration.RoleMigrationException: commit failed, set rollback only
com.sapportals.portal.pcd.gl.PcdRuntimeException: unexpected lock exception when locking - save(xxx).
commit failed, set rollback only
com.sapportals.portal.pcd.gl.PcdRuntimeException: unexpected lock exception when locking
...
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• Enterprise Portal
• NetWeaver AS Java
• NetWeaver AS ABAP

upload role from backend, thread report, error, Error Level, Finished, Completed, Severity, Log Viewer, Enterprise Portal, role, upload, locked, locking, unlock , KBA , EP-PIN-PCD-ROL-UPL , Role upload from ERP , Problem