InfoPath Dev

Hello.  I'm relatively new at InfoPath and I don't understand a lot of the terminology so please bear with me.  I have a maintenance form whereas the firefighters will let us know if the stataion, apparatus or equipment needs repair and if so, what station, apparatus or piece of equipment is in need of repair.  So they either choose the option of Station, Apparatus or Equipment (I have it set so they can only choose one).  I have this working.  Next, we want the firefighter, after he chooses one of the three maintenance issues, to choose what needs repairing.  I have created list boxes under the option buttons like this:   

Option Buttons - I have it so they cannot choose more than one of these three:          Station                   Apparatus                         Equipment

I created a list box under each Option to correspond with the button above.                List box - ST #         List box - App ID's             List box - Equip

I thought if they chose, for instance, Apparatus, they would go to the list box under apparatus and choose the apparatus needing maintenance.  However,  They are going to all three list boxes (station numbers, apparatus and equipment) and choosing one from each list, which is confusing maintenance.  Is there a way to set up a rule on the list boxes that whatever option was chosen, they could only select from a certain list box?  Also, is there a way to make the list box mandatory answer?

Any and all help would be greatly appreciated. :-) 

Thank you

Cath

I don't think you could prevent them from choosing Station, answering that, then choosing Apparatus, then answering that, then choosing equipment and answering that.

One thing would be to provide instructions in the form, so they know to select one, answer and submit.

Another option might be to clear their previous answers if they switch their Option. That is, if they choose Station, answer that, then choose Apparatus, the moment they change their Option, have a rule fire that clears whatever information they entered into the field for Station. Would that help?

How would I accomplish your suggestion to try it?  I do not know how to write rules.

 This is what it looks like.