I have a block that serves as a shelf. The shelf has modules, and I'd like it to count and display the number of modules automatically. I've tried the and field attribute, but it seems to be disabled. That is, after I confirm it, it becomes plain text. Please help, I'd like to understand exactly how this is done. Perhaps I have some settings or properties in AutoCAD that cause the field to be converted to text. I'm attaching a video.
