InfoPath Dev

I have a repeating table that has two seperate drop downs for hotel occupant.  When the check in date is changed, I want it to change the date in another table for travel information, where the value to be set is filtered on the person.  Here's what I tried to do -

concat("SetValue /xpath=/my:myFields/my:Travel/my:TravelGroup/my:Travellers/my:TravelToDate[(../my:Traveller'", Occupant1, "' /value=", .)

This is set on the date field itself.  However, I get an invalid token error. 

So, you need the traveller to be equal to the value of the occupant field?

concat("SetValue /xpath=/my:myFields/my:Travel/my:TravelGroup/my:Travellers/my:TravelToDate[../my:Traveller='", Occupant1, "'] /value=", .)

Yeah, my syntax was off.   Thanks.