1935504 - Package error when function Parallel Execution turns ON

When loading data by using mode "Parallel Execution (On)", then system prompted the error in data package status log as below. If turns off the parallel run function, then it works fine.

[Message]

--------------------------------------------------------------

Task name CONVERT:
Process step executes with parallel

No 1 Round:
Reject count: 0
Record count: 854090
Skip count: 0
Accept count: 854090

Task name LOAD INFOPROVIDER:
Process step executes with parallel
Following line is for technical support
Error Place: Program name(CL_UJO_WRITE_BACK=============CP), Include name(CL_UJO_WRITE_BACK=============CM006),Source line(                                              207)
Error obtaining concurrency lock (enqueue_server_busy)
Submit count: 789788
Reject count: 0

model: XXXXX. Package status: ERROR

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• SAP Business Planning and Consolidation 11.x, version for SAP BW/4HANA
• SAP Business Planning and Consolidation 10.x, version for SAP NetWeaver

SAP Business Planning and Consolidation 10.0, version for SAP NetWeaver ; SAP Business Planning and Consolidation 10.1, version for SAP NetWeaver ; SAP Business Planning and Consolidation 11.0, version for SAP BW/4HANA ; SAP Business Planning and Consolidation 11.1, version for SAP BW/4HANA

KBA , EPM-BPC-NW-DM , Data Manager , Problem