[18.0 bug] sale_stock_picking_invoice_link and purchase_stock_picking_invoice_link with subcontracting and inter company

[lk-eska]

Module

sale_stock_picking_invoice_link and purchase_stock_picking_invoice_link

Describe the bug

these modules use location type (customer and vendor) to calculate pickings but there are cases where other location types are being used:

1. subcontracting: Subcontracting Location type is 'internal'. who can we include this?
2. inter company transfers: Inter-company transit location type is 'transit' which can easily be included.

To Reproduce

Affected versions:

Steps to reproduce the behavior:

1. create a subcontracting or inter company sales purchase
2. it will not link them to corresponding sales/purchase

Expected behavior
It would be good to handle these cases.