If there is a different Revenue Amount between Income Statement, Sales By Item Summary Report and Inventory Profitability Report. Here are the factors affecting the Revenue Amount for each of the mentioned report:
1. Income Statement is affected by all the transactions affecting the Revenue Account. Hence, it includes all of the transactions related to the item and transactions which do not involve item like Journal Entry.
2. Inventory Profitability does not include Revenue from Kit/Package Item but includes the Cost of Goods Sold of the component item. This report only shows Revenue related to Assembly and Inventory Items.
3. Sales By Item includes revenue for Non-inventory and Service Items aside from those for Assembly and Inventory Items.