Invoice lines with pricing fields calculate their amount from quantity, unit rate and discount. Enter the intended quantity and rate, then inspect the displayed line amount. The calculated amount is read only because it comes from those pricing inputs.
An older saved line may contain an amount without quantity or rate. Where offered, Add quantity and rate converts that line to the pricing form. Review the resulting values before saving so the new presentation still reflects the agreed customer terms.
Use the Unit field to explain the basis, such as an hour or an item, when that helps the customer understand the charge. Check the line description and income account separately; a correct multiplication does not establish the correct accounting classification.
If the calculated total differs from your expectation, inspect the quantity, rate and discount together rather than trying to overwrite the derived amount. Save the draft and verify the current document revision before issuance. Catalog-derived lines also retain their copied source context, which should remain understandable after edits.
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