V15 newest, supplier and customer fields are not showed on quick entry form. How to make this work?
Don’t make changes directly in Item Price Doctype because you will lose your changes once you update your app. To make changes, use Customize Form.
The reason it is not visible in the quick entry menu is that it depends on another field. If you check the “depends on” option, you will understand.
If you remove the depend on condition then possible. otherwise, you can also write a js code to achieve it.
Reference: Enabling Child Table Fields in Quick Entry for Contact Doctype - #10 by NCP