Keep invoice type when related from sale or purchase

Feature
,
1

Rational

When a purchase has invoices, you could relate (keyword) from the purchase to invoices and open all invoices in new tab.

In case you create a new invoice, default invoice type is customer.

Proposal

Control invoice type from the “origin”:

A- Not allow new button when list records from a purchase or sale
B- Default invoice type depends from the origin (from the context, … a parameter keyword…)
C- …

Example

  1. A purchase with invoices
  2. Click “Invoices (1)” button.
  3. Create a new invoice. Default invoice type is “customer” when the origin is a purchase (supplier).
2

I do not see the point of making a blueprint for such obvious improvement.
Please just fill a feature request with a patch.