dynamics crm 2011 - how to check an empty field using Enable Rules in visual ribbon editor -

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i'm trying change button enable rules according value rule using visual ribbon editor. rule - if field empty button disabled, insert data visual ribbon editor :

enable rules -  field: myfieldname value:""   //i tried null instead of "", didn't work default:false invert result:true

the output is: buttons act same if field empty or not... missing ?

it should null instead of null

https://ribbonworkbench.uservoice.com/knowledgebase/articles/121427-enable-disable-a-ribbon-button-dynamically-based-o


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