Hi Simon lee
As I see it is currencies. The field is referring to a 'widget' to remove them must inherit the xml model, and remove the widget attributes, as follows:
<record id="ew_product_template_form_view" model="ir.ui.view">
<field name="name">ew.product.template.form.view</field>
<field name="model">product.template</field>
<field name="inherit_id" ref="product.product_template_form_view"/>
<field name="arch" type="xml">
<field name="list_price" position="attributes">
<attribute name="widget"></attribute>
</field>
</field>
</record>
or, if this another model
<record id="id_inherit" model="ir.ui.view">
<field name="name">name_inherit</field>
<field name="model">product.template</field>
<field name="inherit_id" ref="stock_account.view_template_property_form"/>
<field name="arch" type="xml">
<field name="list_price" position="attributes">
<attribute name="widget"></attribute>
</field>
</field>
</record>
I hope you help, regards.