This is good to use when the customers has more categories and each one has more items.
But the feature has to be used in reports page mainly.
Rep306 - Inventory Purchasing Report has the items category, when the user select a category, we can shortlist the items in the list on the next drop down. So its good to use this feature.
And i have one more suggestion, if possible we can use the "get_post()" within the list function like this.
if (get_post('category') )
$sql .= " AND s.category_id='" . get_post('category') . "'";
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HRM CRM POS batch Themes