Added bookkeeping notes, apparently on 1/14/10

git-svn-id: file:///svn-source/pmgr/trunk@937 97e9348a-65ac-dc4b-aefc-98561f571b83

bookkeeping.notes

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+Book Keeping Challenges / Issues
+  - Chart of Accounts is not sufficient
+    - One payment can go towards more than one charge
+    - One charge can be paid for by more than one payment
+    - Need to know: how much money does customer owe?
+    - Need to know: how much money has customer been charged for "Rent"?
+    - Need to know: how much money has customer paid towards "Rent" (nothing else)?
+
+
+  - Reverse a charge
+    To make charge reversal work, I'm presently issuing a credit note
+    (transaction) that has 3 ledger entries:
+       Debit charged account   -  Credit A/R
+       Debit A/R               -  Credit "Credit" account
+       Debit "Credit" account  -  Credit A/R
+    And 3 statement entries:
+       Reversal on charged account
+       Negative Disbursement on "Credit" account
+       Positive Disbursement on "Credit" account
+
+    Obviously, the two "Credit" account ledger entries cancel each other
+    out.  However, the monies need to be reversed in the A/R account, and a
+    previous transaction will have already performed an A/R credit and so
+    the two A/R credits will create an imbalance in A/R unless we move
+    those funds to our "Credit" account.  The "Credit" account statement
+    entries are needed to undo any previous disbursement to the charge
+    being reversed, and then to re-disburse those funds to a different
+    charge (or possibly just a Surplus entry if no other charges exist.)
+
+
+Question
+  - What should be recorded with this charge reversal?
+    Charge of $5 for "Parking"
+    Charge of $6 for "Rent"
+    Payment of $6
+    Reverse the $5 "Parking" charge
+
+  - What should be recorded with this charge reversal?
+    Charge of $5 for "Parking"
+    Charge of $6 for "Rent"
+    Charge of $7 for "Pets"
+    Payment of $13
+    Reverse the $5 "Parking" charge
+
+  - What should be recorded with this charge reversal?
+    Charge of $5 for "Parking"
+    Charge of $6 for "Rent"
+    Charge of $7 for "Pets"
+    Payment of $18
+    Reverse the $5 "Parking" charge
+