This is an Bug within “filterGrid”.
Input-Elements are built with the “index” from the colModel.
But the search-trigger searches input-fields with the with the “name” from the colModel. Therefore, your “index” and “name” fields in the colModel must be exact the same. If there is a difference, filterGrid fails.
colModel-Example:
Works:
{name:'product_erp_id', index:'product_erp_id', width:80, align:'right',