add a new field to Worflow text

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Hello,

I created a workflow that send invoices to my users.

In the text field of the workflow I would like  to add the email address of the customer with a specific function (KCNTFNC).

I tried to add the CUSTOMER table in the formula wizard (new table/view) but it doesn't seem to work.

Even if it did, I don't know how to filter the result by  KCNTFNC.

Do you have any idea how I should proceed? Is it at least possible?

Thanks in advance