FS_CHECKMODE: Check for duplicate address guid

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Symptom
1)Duplicate address guid in but020.
2) Same address guid refers to two different addresses in but020 and bptime_but020
Other terms
bupa_conv_ei2bapi bupa_address_upd_consistent bupa_address_add bupa_create_from_data but020 address guid
Reason and Prerequisites
Address guid in but020 and bptime_but020 should refer to the same address. But no such check is done to ensure this.
Solution
Please apply the corrections of the note