Hide actions based on a condition

Hi

I have a custom action entitled to a blueprint that allows me to attach Oracle ASM Disk Sets. The action will attach a set of ASM disks to the VM. Once this task is completed I need a way to hide this action so that it doesn't get requested again. Ideally I'd like another action to take its place called 'Detach ASM Disk Sets'.

What I can't figure out is how to create such a condition. I can't see anything in the conditions for the action that I could use.

Does anyone have any ideas or has done something similar?

Thanks,

Gavin