Capture link: add a new filter by row

Hi guys,
I have a multiple form where there is a supplier column.
In another column I have a capture link pointing to a grid where documents associated to the suppliers are displayed.

Currently it works but it displays the documents for all suppliers and my intention is for each row, add a filter to the capture link so that it displays only the supplier document listing for that particular row?

I have tried but to no avail as it always takes the first supplier in the list.

Any idea that could be useful (in case it can be done)?