so you have two context , contextA and contextB
they are sharing inside and outside
Ip address of ContextA outside = 10.1.1.1
IP address of ContextB outside = 10.1.1.2
IP address of contextA inside = 1.1.1.1
IP address of contextB outside = 1.1.1.2
You need to define the translation for an address of ContextA e.g. 1.1.1.5
this host will only be reachable via contextA. If you define the translation on both contexts it will confuse out the contexts and classisification will fail.