hello again, and thanks for your reply. Yes the values are stored in acf.
This is the url when i get no results. The field name is barcode and value in this product is 010101.
wp-admin/edit.php?s=010101&post_status=all&post_type=product&action=-1&product_cat&product_type&stock_status&paged=1&action2=-1
I send you 2 printscreens of the search action
https://megaupload.nz/bd80J5y5n5/printscr_rar