Is there anywhere a list of valid syntax for Action Expressions in the Parameters Manager in AutoCAD? I have two Angular actions in a dynamic block (they could be linear also) created with the Rotation Set selection on the Block Authoring Palettes - All Palettes (Parameter Sets). One has a name of Angle1 and the other Angle2. The Expression column in the Parameters Manager accepts pure values, but does not seem to accept anything else, not User Parameters, not Attribute values set from Fields, nothing.

The AutoCAD Help system is glaringly silent on this, and an hour of searching turned up nothing. Sigh! Any help, anyone?