AutoCAD Architecture :: Select Object To Tag

We have a schedule tag for space objects created on our tool palette. When you use the Multiple option, you cannot do a window selection unless only spaces are visiable. If other object types are in the selection set, the program seems to get hung up... no error is produced... it just seems to spin relentlessly. We have to Cnt+Alt+Delete to get out of it. You cannot preselect the spaces and use 'P' for previous selection set, since the last selection set was the first one you selected to place the first shedule tag.

I thought I could create a tool to return the selection set to the select object prompt with the simple line of code, like this - this should work but does not:

(ssget "X" (list (cons 0 "AEC_SPACE")))

it returns the spaces to the prompt, but for some reason they get filtered out.Below is the command line snippet that shows multiple attempts...

Command: _AecScheduleTag
Select object to tag: Specify location of tag <Centered>:
Select object to tag [Multiple]: m
Select objects to tag: (setq ss (ssget "X" (list (cons 0 "AEC_SPACE")))) <Selection set: 12dc> 7 found 7 were filtered out
Select objects to tag: !ss <Selection set: 12dc> 7 found 7 were filtered out, 0 total
Select objects to tag: !ss <Selection set: 12dc> 7 found 7 were filtered out, 0 total