How to display amount fields with currency in overview engine?

Engines Overview Engine
1

How do I display the currency of a amount field in a column of an overview table? (version 2020.02)
Alternatively: How can I add an expression as a column?

(Is there a ticket for it?)

2

I dont know how it is in version 2020.02. But in the version we use you only need to implement a ā€œConversionServiceā€. You can give it as property to the overview engine and then you can controll which formatter is used by A12 Model Annotations:

import { ConversionService } from "@com.mgmtp.a12/validation-api/lib/main/conversion/api";
export class OverviewConverters implements ConversionService {
    private readonly simpleConverters = new SimpleConverters();
    private readonly currencyFormatScale2;

    constructor(locale) {
        this.currencyFormatScale2 = new Intl.NumberFormat(locale, { style: "currency", currency: "EUR" });
    }

    convertToDocument(value: string, field: Field, locale: Locale): BaseType {
        if (value === null || value === undefined || value === "-") {
            return undefined;
        }
        const annotation = field.annotations.format;
        const format = annotation && annotation.value.value;

        switch (format) {
            case "number_scale_2": return this.numberFormatScale2.format(Number(value));
            default: return this.simpleConverters.convertToUI(value, field, locale);
        }
    }
}
3

Regarding your second question:
Currently, expressions are not supported by the overview engine. Though, there is ongoing discussion if and how the feature should be implemented.
For further information and updates on this topic, see [A12-10465]<INTERNAL_LINK>