Multiple Schema, single primay key set

We are running with multiple schema (basically 1 for each month) to assist with reporting.

We have a rule that users can go back and continue to modify old records/schemas. I need something a way to keep the primary keys unique across these schemas. My thought is to create a single table with the primary keys and create an alias for that table on the other schemas.

Is the possible? Is there a single table that keeps the primary keys? Would aliasing this table be work?

We are running on Oracle.