When I implement or synthesize a schematic design, the following message occurs:
"DesignEntry:218 Net <net_name> is connected to source pins and/or I/O markers, but not connected to any load pin or I/O marker"
This is a valid error, and it occurs when a net is connected to a source (output pin of a symbol or an input I/O marker) and is not connected to a load (Input pin of a symbol or an output I/O marker).
To remove this message, connect the net to the appropriate I/O marker or load pin.
To change this error to a warning message, follow these steps:
1. Select Edit -> Preferences -> Schematic Editor -> Check.
2. Change the value of "Consider Loadless Nets and IO as" to Warning.