I have created Text Area field under Quote line items in Quotes module but that field is not editable for old records and it is editable for newly created records.
In quote-data-group-list.php file I kept array like this
'name' => 'specification_c',
'label' => 'Specification',
'widthClass' => 'cell-xlarge',
'css_class' => 'description',
'type' => 'textarea',
I also updated that field in record.php. Does anyone knows how to create textarea field in Quote line items in Quotes module?