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Why do products exhibit different behaviour when included on successive bills?

ContactsLaw makes certain assumptions about products when they are included on successive bills, depending on their charge policy and whether they have been included on previous bills. The following table summarises that behaviour:
 
Charge policy
Behaviour on first bill*
Behaviour on successive bills
As recorded
Product appears if estimated or recorded.
Billed = recorded
Product appears if recorded only.
Billed = recorded
Fixed amount
- qty not permitted
Product appears if estimated or recorded.
Billed = estimated
Product appears if recorded, accompanied by a warning that it has already been billed.
Billed = $0
Fixed amount 
- qty permitted & preserved
Product appears if estimated or recorded.
Qty = estimated
Billed = estimated
Product appears if recorded.
Qty = estimated - billed
Billed = qty * charge
Fixed amount
- qty permitted but not preserved
Product appears if estimated or recorded.
Qty = recorded
Billed = qty * charge
 Product appears if recorded.
Qty = recorded
Billed = qty * charge
Maximum cap
Product appears if estimated or recorded.
Billed = [recorded or maximum]
Product appears if recorded, accompanied by a warning if the maximum has already been billed.
Billed = recorded.
 
* - refers to the first bill which the product appears on, as opposed to the first bill on the file.