The newest version of CasperJS deprecates the use of `.fill()` for forms. Instead the recommendation is

> Changed in version 1.1: To use CSS3 or XPath selectors instead, check the fillSelectors() and fillXPath() methods.

Something like the following would be more correct:

    casper.fillSelectors('.jeditable-container .jeditable-field[data-alias="' + tenantID + '"][data-field="displayName"] form', {
        'input[name="value"]': 'New tenant name'
    }, false);