You have sent a Query payload to the system, and in the response, you see that the system is returning multiple list prices, even though in the UI you see only one price.
SAP Business ByDesign
Example: Customer Invoice.
The system displays more than one list price, as the Query results show all the prices that were determined for the product in Invoice Document.
This is the expect system behavior.
Please see an sample Request payload below (XXXXX represents the internal system IDs.):
Double; Price List; Response; Query; Web Service; , KBA , AP-CI-CI , Customer Invoice , How To