How would I create a filter in the Product Variants screen that would remove all variants that are currently on either a quotation, sale order, invoice etc...??

The filter "Stock move ids is not set" does not remove all variants that have quotations or sale order/invoices associated with them as I get the following error when trying to delete them;

Odoo Warning - Validation Error

The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set

[object with reference: Invoice Line - account.invoice.line]

This is when the product is on a Invoice.

Odoo Warning - Validation Error

The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set

[object with reference: Sales Order Line - sale.order.line]

This is when the product is on a Quotation.

How do I create a filter that returns results that have only variants with no associated quotations, sales order or invoices attached to their id??

Is anyone here capable of writing such a filter??

Odoo10 Enterprise

Trying to clean out unused variants before upgrading the database.

Any help would be really appreciated.

Thank you.