Why can't I use Slices as the source in my Actions, I found a workaround method to achieve what I wanted to do but it would have been so much simpler to be able to use my Slice as the source table.

I have two actions that Fill in data to a Table and I needed to filter the Parent table so that I only provided data to the linked table for a particular record and a particular Date. I started off by making a Slice that did just that and expected to be able to pick that Slice in the Choice of tables upon which my Action was based. I was surprised to find that my slice wasn't available.!