Hi there, ERC gives this problem. What confuses me is that should data pins also have to be driven by any other pin, as there is a clear connection between the MCU and the momory as shown on the pics.
I am not sure bidirectional is the correct type here. I have not looked at the datasheet but pins starting with “A” on a memory chip are normally the address input pins. If they are however the data in/out pins then they could potentially be some type of pin that can be both input or output. These could then for example be bidirectional or threestate.
You might want to check Electrical type of schematic symbol pins (KiCad 4 and KiCad 5)
If OE is “Output Enable” it should be defined as input and not output, are you sure the LTC6903 is from the official library ? I do not have it on mine and as you see I have all the 15K+ symbols.