Error: Process Properties: Rule input vehilce (KSS_Vehicle?list) is currently matted to a process variable of type KSS_Vehicle

I don't ever recall seeing this level of validation error, but it seems to be saying that the data type for your 'vehicle' rule input is of type KSS_Vehicle?list - that is, an array of data - whereas the process variable it's being mapped to is of type 'KSS_Vehicle' (i.e. singular and not an array).

Normally when you map an array to a single value Appian simply takes the first item in your list, maps it and dumps the remainder, which is why I don't recall seeing this before. Normally I scratch my head trying to work out where the rest of the data disappeared to, and then remember this is how Appian behaves when such a mismatch in cardinality occurs.

Hi,

Check the following in your process model and user input task configuration.

• Check is your process variable is also accepting Array of KSS_Vehicle

• Don't map your process variable directly in form tab.

• Make sure map your process variable is configured in form input tab with same CDT type. You need to add activity class variables to map rule inputs and then map activity class variables to your process variable

Hope this helps

Thank you! I did check to make sure we had everything this way, and we did. I ended up just removing the vehicle process variable and re-adding it. Why that works sometimes I have no idea. But thank you!!