SAP T-Code search on FZ-
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FZ-1 - Number Range Maintenance: FVV_DEBIT
FZ-2 - Number Range Maintenance: FVV_PARTNR
FZ-3 - Number Range Maintenance: FVV_VORG
FZ-4 - No.range maintenance:FVV_ADRNR
FZ-5 - Number Range Maintenance: FVV_OBJNR
FZ-6 - No.range maintenance:FVV_PARTID
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