Error 'Value does not exist or does not match filter criteria' when Quote Line Item is added

Root Cause

When a Quote Record is synced to an Opportunity, any update to the Quote triggers validation rules on the Opportunity — including Lookup Filter validations — even if the relevant field is not on the page layout.

Resolution Steps

Updating the Quote Record that is being synced causes an update on the Opportunity and as a result, validations are run and Filter Lookup Validations trigger even if the Field is not on the page layout.

Ensure there are no Lookup Filters on the Opportunity and if there are, ensure the Opportunity Record in question still meets the criteria (just hit edit and save and see if validations fire).