if you really need to join AltAct1 and Date1
can you rename country_code as country_codeSh column in Sheet table.
and also add one more column in AMSR table country_code as country_codeSh
AltAct1 as Date . it will create a Sync key but remove Circular reference .
for removing sync key you can concat fields country_code & AltAct1 as Key2 in both the table.
Now you will not get any sync key not circular ref.