non esri SQL table with mixed geometries

Hi

I have a SQL database. In this SQL database is a SQL Spatial table, from a NONE Esri source. This table has mixed (ug!) geometries, points, multiponts and polygons. This table is from a third party application and I have NO control over it.

I can view the data OK in ArcMap, when I add it on, I have to choose the geometry type and unique field.

However, if I try to do anything with layers I get a 99999 error "Invalid Entity type"

What I'm trying to do is to take this source, buffer the point features, then merge it with the polygon features to create a single ArcMap friendly layer.

Cheers

ACM