| Class Variables | id | the id of the sale table
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| coupon_id | the id generated by the fiscal printer
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| open_date | the date when the sale was started
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| confirm_date | the date when the sale was confirmed
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| close_date | the date when the sale was closed
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| cancel_date | the date when the sale was cancelled
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| notes | sale order general notes
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| status | the sale status
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| salesperson_name | the salesperson name
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| client_name | the sale client name
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| client_id | the if of the client table
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| subtotal | the sum of all items in the sale
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| surcharge_value | the sale surcharge value
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| discount_value | the sale discount value
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| total | the subtotal - discount + charge
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| total_quantity | the items total quantity for the sale
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| invoice_number | the sale invoice number
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