When editing medicine quantity for an aid package, an error message that does not make sense shows

[nshamit]

• Error message that does not make sense shows: "Already done Pledges amount exceeds the Aid Package Item Quantitiy Update"

This aid package does not have any pledges towards it yet. I'm not sure why this is showing.

To reproduce:

1. Go to prod, aid package TEST3 | Blood Bank Supplies
2. Edit the medicine quantity of the first medicine from 1000 to 500.
3. Receive message in the screenshot attached here.

[nshamit]

As of Sept 19, still showing:

[AmilaJ]

Messege Triggered from
https://github.com/LSFLK/MedicinesforLK-AdminAPI/blob/bad7c4b024cd73e27e9c0333d5c9f21dd6d00239/service.bal#L132

Happens due to following method is not evaluating correct at
https://github.com/LSFLK/MedicinesforLK-AdminAPI/blob/bad7c4b024cd73e27e9c0333d5c9f21dd6d00239/db_processor.bal#L435

One suspect scenario is already pledged amount will be zero but when calculating aid package total amount with the update if gives some negative value. may have to check with the real values.

[nshamit]

Replicated this :

1. create aid package with NO pledges
2. edit quantity/-ies
3. Get error message (see below)