Stock availability not imported on products with variants

Hi there!,
Mario from ITaly.
the plugin is excellent but I can’t import the stock availability for those products that have variants.
I also installed your “variation Swatches” plugin.
on products without variants I see the correct warehouse quantity imported from shopify.
On products with a variant I only see the words “available”.
furthermore the “manage inventory” flag is disabled for products with variants and i cant import the quantity.

Many thanks for your support.