fluid type mix warning without any fluids in it.

[t-lor]

So i needed a some heavy >light oil convertins
So i just blueprinted my light>petrol build. and pasted it again.

Then i would expect its just a matter of changing the recipe, and connect the pipes.
But even whitout any fluid in it (pipes are not connected to anything),
i cant change the recipe because i get a " cant mix fluids warning"

[tehfreek]

All connected buildings are checked to see if fluids would be mixed, not just pipe contents.

[Loewchen]

This is intended behaviour, you can either omit the last pipe to the producing entity in the blueprint or create dedicated blueprints. NaB.