This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:
This is the expected behavior of a bus signal. If a bus enters a Signal Conversion block whose mode is set to contiguous copy, the signal leaving the block should be treated as a vector. Specifically, a Bus Selector block should not be placed on the signal leaving the block. Even if a Bus Selector is connected to the signal leaving the Signal Conversion block, the signals in the bus will be visible in the Bus Selector dialog box. Therefore, although it may appear that it is valid to use the Bus Selector on that signal, this practice is not permitted.
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