Filter search on Custom Table field within overview on an object.

Who would benefit?

Anyone who uses custom tables to provide values.

What impact would it make?

It makes finding values simple

How should it work?

If I have a custom table like the following in image simple1.png it only allows me to search on the title field when this mapping is added to an overview tab via a many to many custom field. (see simple3.png)

It would be very useful if search also returned items contained in other columns (eg, Ref# in this example).

Additionally, allowing which columns could be searched would be an extension.