2736540 - Ping channel failed for RFC channels with load balancing enabled

You use PI RFC Sender or Receiver channel with load balancing enabled, with port number maintained in "Message Server Service" of RFC Channel.
The channel works and messages can be processed successfully.
But the ping channel failed with error:
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Backend System Availability Test - Backend System **** is currently not available  
Metadata Repository Availability Test - Metadata Repository **** is currently not available
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• PI Release Independent
• SAP NetWeaver
• SAP Process Integration
• SAP Process Orchestration

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.1 ; SAP NetWeaver 7.2 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

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