You can't map to Total Price, as it will result in the following error.
Error : Error | related list entry error: FIELD_INTEGRITY_EXCEPTION - field integrity exception: TotalPrice (total price must be specified)
Total Price is a standard formula field that takes: Sales Price x Quantity x Discount / 100.
Out the box, we map the following from NetSuite to Salesforce:
Items: List Rate -- OpportunityLineItems: Sales Price
Items: Qty -- OpportunityLineItems: Quantity.
This error can occur if you have accidentally removed mapping for either of these. If that doesn't solve your problem, let us know so that we can improve this answer!
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