[已解决]根据form数据 控制默认按钮(编辑/创建)
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<record id="invoice_form_inherit" model="ir.ui.view"> 
 <field name="name">invoice.form.inherit</field>
 <field name="model">account.invoice</field>
 <field name="inherit_id" ref="account.invoice_form"/>
 <field name="arch" type="xml">
 <xpath expt='//form[@string="Invoice"]' possition='attributes'>
 <!-- Frist intent : nothing happened -->
 <attribute name="edit" attrs="{'invisible:[('state','=','paid')]'}"/>
 <!-- Second intent : edit, always hide -->
 <attribute name="edit" attrs="{'invisible:[('state','=','paid')]'}">false</field>
 <!-- Thirds intent : edit, never hide -->
 <attribute name="edit" attrs="{'invisible:[('state','=','paid')]'}">true</field>
 </field>
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attrs="{'invisible:[('state','=','paid')]'is not needed 
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