FAQ: Why am I getting a FIELD_INTEGRITY_EXCEPTION on Total Price?

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!