In this POST problem what is the problem that a programmer detects ?

[lmfgkfd]

This Post problem is: that when trying to give 20% discount to the 3 customers who have flown the most with the company in miles quantity; filling out in an Excel file how much miles have you traveled...every customer with the company; and then crossing over the customers nformation who has bought more tickets in the Excel file; gets the error that when generating the miles report in the system there appears dupilicated IDs for different customers

 

[lmfgkfd]

actually the initial title for the question is In this POST problem ¿ What is the problem in a programmer point of view ?

 

[alexcray]

This Post problem is: that when trying to give 20% discount to the 3 customers who have flown the most with the company in miles quantity; filling out in an Excel file how much miles have you traveled...every customer with the company; and then crossing over the customers nformation who has bought more tickets in the Excel file; gets the error that when generating the miles report in the system there appears dupilicated IDs for different customers

You're likely crossing out rows in the Excel sheet to identify frequent flyers. This removes those customers from the data used to generate the report, potentially creating duplicate IDs for remaining customers.