advanced awesome calculated computed custom fields
I didn't find this in features or in plugins.
The guys from EasyRedmine did great job, but when I contacted them, they said that Calculated (computed) custom fields supported only EasyRedmine, it doesn't work with Redmine-Core. It's really pitty.
1. develop or adapt Calculated (computed) custom fields (scren) for Redmine-Core
2. Improve functionality. Add сalculation by taking a sample of data from other issues(custom fields,fields).
Because now, (1) calculate data only from 1 issue. We need
For example We have issue with tracker "Invoice" and custom fields: a) invoice_income, b) invoice_expences
And We have issue "Contact" with custom fields %Revenue_per_month
Please see example