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More than likely you will need to supply a packaged workbook as this greatly helps others in trouble-shooting your issue and coming up with a solution that precisely works for you.
On the right side of the page you'll see additional links to help you:
Since they are Measures you should be able to use them in a new calculated field.
Create a calculated field:
Use this formula:
[Meses Entregues KPI] - [Meses faltantes KPI]
I copied your names from above, make sure these are the actual names of your fields
Tableau will suggest existing fields when you start to type them in
I tried that and didn't work.
Tableau keeps saying I can't mix aggregate and non-aggregate arguments.
Thank you very much!!!!!!!!!!!!