Hello Mak,
In 7.0 there is no code in the inbound plug method ip_fromcorpaccountsalesareasef. After clicking on edit button it navigates to window "salesareaedit" and inbound Plug is called. and, moves to the BP_SALES/CorpAccountSalesViewSet which has two views BP_SALES/CorpAccountSalesAreasEF and BP_SALES/CorpAccountOrgEF.
which version are you using??
Thanks,
Amit