It took me quite some time to figure out your query and my solution isn't a pretty one, but at least it gets the job done.
Start by copying both the Article and the MvT columns and paste them outside your list next to each other.
When I copied your list it consumed the range A1:E27. So I pasted the copied columns in range A29:B55, but of course you can place it anywhere you want.
Now select range A29:B55 and go to Data>Filter>Advanced filter.
On the Advanced filter window select "Copy to another location", copy to range D29:E55, select "Unique records only" and click OK.
Now use F30 to input the following formula: =IF(D30=D31,D30,"").
Drag the formula in F30 down untill you reach the end of the list, in this case F47.
Now feast your eyes on the result in range F30:F47. Every article listed here have both MvT 303 and 305.
Can you work with this?