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title "Locking and Unlocking Member Account"

participant Member as member
participant Frontend as front

participant Backend_API as back
participant ERP_DB as erpdb

activate front
activate back

loop [ for until fail_cnt is 5 ]
 member->front: enter id/pass in login page
 front->back: find id/passwd of member
 back->erpdb: add fail_cnt +1\n if member id/pass mismatched
 back->erpdb: lock member record \n if fails until 5 times
 back->front: or response 507(mismatched)
 front->member: show message(mismatched)
end
     

back->front: response 509(failure-limit) if over 5 times
front->member: show message(mismatched)

deactivate back
deactivate front
deactivate member