Add main attributes in (MMS240) view

Main attributes for the serial number have been added to the field group MM240. This makes it possible to select and view them in 'Equipment/Serialized Item. Open' (MMS240) Main attribute fields that have been added are: &MAAT1 to &MAAT5, &MATD1 to &MATD5, and &MATI1 to &MATI5.

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