EDI - how to append loop values in the single Navision field

landlord

Hi,

I have issues with EDI mapping.
I have got 3 MSG segments in the flat file:

MSG~Value 1!
MSG~Value 2!
MSG~Value 3!

I would like to map them to a single Navision field e.g. Sales Header Description field.

So after mapping I would have the following field values in description: Value 1Value 2Value3.

I tried to mark 'Append to field contents' but it takes only last value: Value3.

How can I append those 3 values into one single field?

Thanks.