Accounting document

HI,

1. for zf2 billing type cancelation invoice is S! & accounting doc type is RV

But when S1 is created, accounting doc type is also RV

-from where this document type RV for s1 is coming

-how to make zf2 billing number range & Acounting document number range same

2.. In (J1iin) excise invoice DLFC -Accounting document type is coming as SA G/L Account Document.

but i checked in OBA7 for SA reversal type is AB

& when i cancelled excise invoice & checked in j1ih -Accounting document is coming as SA itself.