add snippets

snippets/sale.view_sales_order_filter.add_filter_collective_invoice.xml

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+<?xml version="1.0"?>
+<data inherit_id="sale.view_sales_order_filter" priority="50">
+
+  <xpath expr="//filter[@name='my_sale_orders_filter']" position="after">
+    <filter string="Kunden mit Sammelrechnung" name="customer_collective_invoice" domain="[('partner_id.category_id.name', 'in', ['Sammelrechnung'])]"/>
+    <filter string="Kunden ohne Sammelrechnung" name="customer_collective_invoice" domain="[('partner_id.category_id.name', 'not in', ['Sammelrechnung'])]"/>
+  </xpath>
+
+</data>