What are the classes involved in Journal Posting, Sales Order Invoice Posting, Purchase Order Invoice posting,   1) Journal Posting : LedgerJournalCheckPost class   2). Sales Order Posting : SalesFormLetter Class and SalesFormLetter_Invoice class   3). Purchase Order Posting : involPurchFormLetter,PurchFormLetter_PurchOrder,PurchFormLetter_Receiptlist,PurchFormLetter_PackingSlip and PurchFormLetter_Invoice classes are involved.  
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