Ways to update process variable in embedded forms?

Camunda 7 Topics Discussion & Questions
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Here’s my diagram.gm-approvalDiagram.bpmn (14.8 KB)

it’s a 2 step approval process with return feature. My question is how to update process variable when my request is returned. I get this error now that I use this construct.

<!-- Customer Type -->
<div class="grid-item">
    <label for="customerType">Customer Type *</label>
    <div class="controls">
        <select required
                class="form-control"
                cam-variable-name="customerType"
                cam-variable-type="String">
            <option>1xxxxx</option>
            <option>2xxxxx</option>
            <option>3xxxxx</option>
            <option>4xxxxx</option>
        </select>
    </div>
</div>

Error:
Form Failur: Cannot add variable with name customerType: already exists.

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