Add Number as a Supported Field Type
Code
Filename: gpi-add-support-for-field-type.php
<?php
/**
* Gravity Perks // Inventory // Add Number as a Supported Field Type
* https://gravitywiz.com/documentation/gravity-forms-inventory/
*/
add_filter( 'gpi_supported_field_types', function( $field_types ) {
// Update "number" to desired field type.
$field_types['number'] = true;
return $field_types;
} );