Why should a bill of sale for appliances the buyer would like to purchase be made an addendum to the sales contract?

The bill of sale must be an addendum or the lender may find that the buyer is not qualified to purchase the property.

The bill of sale must be an addendum or it is reduced to a verbal agreement, which may violate the Statute of Frauds.

The bill of sale must be an addendum to be enforceable. The bill of sale must be an addendum to be valid.