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Unfortunately, we cannot select with CSS checked Inventory widget field.
However, selected field involved in calculations receive a calculatedOperand class, so it can be used to style them.
I have added the next CSS to your form in order to illustrate this.
background-color : #82b707;
The downside is that the calculatedOperand class is not remove once the value of the Inventory widget is changed back to 0.
If you need any further assistance, please let us know.
Agradeço a ajuda.... muito obrigado ! é exatamente isso que eu precisava !