Argentina: You are trying to create a sales document for a customer who is subjected to gross income perception. Wrong gross income perception condition values can occur e.g. when changing quantities or switching in VF02 from item pricing view to header pricing view. Other terms
Pricing, Gross income perception, Tax categories Reason and Prerequisites
Programm error. Solution
This is only relevant for Argentinian company codes, and if you are
dealing with customers partially subjected to gross income perception.
https://service.sap.com/sap/support/notes/155001 (SAP Service marketplace login required)