You can really do it either way, but when you do it how you did it, it just doesn’t provide you the message let you know it is not the correct input configuration for the Fire. It will work with a regular EOL configuration, but you lose the Fire Trouble function. Losing the EOL Resister will result in a Fire Alarm if you use the regular EOL instead of the 4/w configurations.
When you save the Bus Device Inputs, it checks it then which resulted in telling you had an incompatible configuration with the Fire Zone.