I'm pretty sure this cannot be done, but need to confirm.
I configured an ASA with 2 contexts, the customer expected that I could share the same IP address space outside for both contexts using the same physical interface. Wjen I configure the outside address on context 2 the ASA complains that the same address is used on another interface, it ism in context 1. Is there a way round this? Documents on CCO show its possible by using vlans, setting up the physical interface as a shared, but that is not what my customer wants.
I've said I'm sure this cannot be done, but want to sanity check my statement.