There can be no use in arbitrarily assigning transistor collectors and emitters as inputs and outputs, when they are used for both. (You can set the error condition from error to warning to disabled, as you wish.) In analog designs, it is typically a hindrance: most of the pins are usually passive type (ignore ERC) to begin with, or at the very least, bidirectional - not in the digital / ERC sense, but literally, that the current and voltage may flow with either polarity. If you design is not helped by such a tool, you may consider simply disabling it under Project Options. For example, to avoid driving outputs from other outputs, or to leave inputs hanging (the case here). FYI to the OP: ERC (Electrical Rules Check) is a tool that you use to help verify the correctness of your design. Type P, V, N first, then click the pins desired.
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