RPM warning: package X = v1 was already added, replacing with v2...

["German Cancio Melia" <German Cancio Melia cern ch>]

... but sometimes I want to install both v1 and v2, in the same
transaction. I know it works by installing v1 and then v2 in different
transactions. Is there any way of telling rpmlib (I'm using the python
bindings) to not try to skip v1?

TIA,
	German