When trying to insert a Sprinkler Head Schedule (SHS command), after viewing the setup dialog box, then selecting sprinkler heads, when asked to select a location for the guide, you get the error;

Please pick start point for schedule

Error: bad argument value: non-negative: -1

When trying to insert a sprinkler head schedule, after selecting the heads and attempting to select a point to insert the text, you get the following error;

Command:
Select Heads to put in schedule (as in by floor) or Right-Click to add all heads to schedule
Select objects: Specify opposite corner: 8 found
Select objects:
Please pick start point for schedule
Error: bad argument value: non-negative: -1
 

If the user runs the sprinkler head schedule, the dry volume text window will not appear. DRYVOLU or DV HydraCAD 52.03 r1