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<p>Hi Niccolo,</p>
<p>I ran into the exact same problem yesterday. I opened an issue:</p>
<p><a href="https://issues.qgis.org/issues/17170">https://issues.qgis.org/issues/17170</a></p>
<p>Are you sure that this worked in earlier QGIS versions? It would help to know that.</p>
<p>Andreas</p>
<p>On 2017-09-21 00:58, Niccolò Marchi wrote:</p>
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<p class="MsoNormal">Hi all,</p>
<p class="MsoNormal">I'm using 'refactor fields' in the modeler.</p>
<p class="MsoNormal"><!-- o ignored --> </p>
<p class="MsoNormal">Once I've loaded the fields from a shp and then added some new ones, I'm not able to add a formula (e.g. 'to_int(substr("MM_GG", 1,2))' ) to the latter ones because it's recognised as wrong in the Expression dialog. Furthermore, the Expression dialog doesn't recognise any field in the label 'Fields and values' and simply shows 'NULL'.<!-- o ignored --></p>
<p class="MsoNormal">BTW, if I write the formula directly in the box without using the expression dialog and then run the model, it works smoothly.</p>
<p class="MsoNormal">Are those intended behaviours?</p>
<p class="MsoNormal"><!-- o ignored --> </p>
<p class="MsoNormal">i just updated from 2.18.11 to .13 .<!-- o ignored --></p>
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<p class="MsoNormal">all the best,<!-- o ignored --></p>
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<p class="MsoNormal">Niccolò<!-- o ignored --></p>
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