hide / remove charge only once / qty override in store settings shipping pro dashboard for vendors wc vendors pro

functions.php

add_filter( 'wcv_shipping_national_qty', 'change_wcv_shipping_national_qty' );
function change_wcv_shipping_national_qty( $field ) {
		$field['label'] = __( '' );
		$field['type'] = 'hidden';
		$field['value'] = 'no'; 
		$field['wrapper_start'] = __( '' ); 
		$field['wrapper_end'] 	= __( '' ); 
		return $field;
}

You forgot to pass the field variable to the function. Fixed. But it still didn't work because there was a bug in the qty override code for the shipping class. Which I have now fixed.

add_filter( 'wcv_shipping_national_qty', 'change_wcv_shipping_national_qty' );
function change_wcv_shipping_national_qty( $field ) {
		$field['label'] = __( '' );
		$field['type'] = 'hidden';
		$field['value'] = 'yes'; 
		return $field;
}
add_filter( 'wcv_shipping_international_qty', 'change_wcv_shipping_international_qty' );
function change_wcv_shipping_international_qty( $field ) {
		$field['label'] = __( '' );
		$field['type'] = 'hidden';
		$field['value'] = 'yes'; 
		return $field;
}