Hi @paulinaMB ,
If I have correctly understood, you are looking for an example about how a processing rule setup could contradict each other.
This can happen if you have multiple processing rules setup to overwrite value of same variable.
For example, Rule#1 is setting up an evar1 with a value, now there is another rule#5 setup which is again setting up a value in an evar1. In this case the latest rule will take the precedence, evar1 will have value which was set via rule#5.