1.Issue Reproducing for -1 flat amount value
2.Code debugging for getting subrate grid values,and finding out the impact of flatAmount for values of -1,-2,0 and blank values and checking it through backend

Code debugging for Life subrate Grid values and FlatAmount Values for the values of -1,0,-2,Blank values .Fixing validation for negative values,Testing.

discussion

Code debugging for values of Flat amount negative and positive values as well as NULL values.Script Execution For checking impact on the backend values of Flat amount after fixing.

Analysis.
Code debugging.

Code Fixing for the issue reproduced for the negative,-1 and NULL values.
Unit testing after code fix.
Verifying the backend values of Flat amount after code fix

Analysis.
Coding.
Discussion with Nitish.
unit testing.

Code merging and Code checkin on LB ,Unit testing for changes fixed

Code review of code fix
Unit testing and Impact different scenarios
Query execution

Analysis and Debugging of code for testing the Scenarios for -1 flat amount and negative values.
Code fixing for the Same

Code fixing for other Scenarios along with negative values.code compare of Production and trunk code.Unit testing for the same fix

LB testing

discussion and testing