// JavaScript/JScript in CRM 2011 | CRM 2011 Training Series
    //How to Get the value from a CRM field
    var varMyValue = Xrm.Page.getAttribute(“CRMFieldSchemaName”).getValue() ;

//How to Set the value of a CRM field
Xrm.Page.getAttribute(“po_CRMFieldSchemaName”).setValue(‘My New Value’);

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