3545840 - Missing P4 / P4S port information in SSI edit configuration

You are trying to perform SSI Edit Configuration for a Managed System of type Java.
In the LMDB you can see that the P4(S) port is available for the Managed System.
But the SSI edit configuration screen leads into the following exception:
Value of the property 'P4(S) Port' must have one of the values: <port number>
Value of the property 'P4(S) Port' cannot be empty

In the P4 Port dropdown selection you can see the following:
<port number> (not available for 1 hosts)

SAP Focused Run 4.0

KBA , SV-FRN-INF-SSI , FRUN: Simple System Integration (SSI) , Known Error