The Manufacturing area (MAA) on an article is retrieved from the Manufacturing area (MAA) application. 

There is a manufacturing area number (MAANO) on the article (ART) which reflects which manufacturing area (MAA) it applies to.

To add the 'name' of the manufacturing area (MAA) in a report, a link to the manufacturing area (MAA) field has to be used via the  manufacturing area number (MAANO).

More information as to how to add a linked field in a report can be found here: Link fields in reports