That method doesn't seem to be working since beta 4, you can reload it but the store munition status will still Fail
To reset hung store you need to reprogram the MFD button to Load and Reload DSMS only. Same method when you reload your DSMS to rearm.0
Check manual page 253
or here follow my sloppy instructions.
1. Press and hold down one of the OSB button in the bottom (OSB 12-15) In this case we'll change the "Task" button OSB15 on the left MFD
2. You will then see Display Program and on the right hand side Select Load and press on OSB15 to reprogram the Task button to Load.
3. Now that your button is reprogrammed you can now click on it and get to the Loading page and on the left hand side press LOAD DSMS and that will reload your DSMS and clear out any hung stores you have.
4. That's it, if you want to change the button back to what it was just follow the above step and reprogram it back.