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I have some code:
<tree colors="red:value_id!='' and mandatory==True">
<field name="mandatory"/>
<field name="attribute_id"/>
<field name="value_id"/>
</tree>
Whatever if value_id is set, or not it is always true! Did I something wrong?
Ok. I solved it.
<tree colors="red: not value_id and mandatory">
<field name="mandatory"/>
<field name="attribute_id"/>
<field name="value_id"/>
</tree>
instead != I should use 'not'
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