thanks james & kennin for your email, I was absent for a while! I found meanwhile the following code and solved the problem!
add_filter( ‘woocommerce_product_tabs’, ‘remove_woocommerce_product_tabs’, 98 );
function remove_woocommerce_product_tabs( $tabs ) {
unset( $tabs[‘description’] );
return $tabs;
}
add_action( ‘woocommerce_after_single_product_summary’, ‘woocommerce_product_description_tab’ );
john