ServiceStudio is usually very helpful in 'guessing' the intended data type of a new variable or attribute.
However, sometimes, when I change the name of a variable or attribute afterwards, Service Studio again 'helps' me by changing the data type, which I don't always want.
It would be helpful to have a little undo button somewhere in the data type property field, so I can undo the automatically data type change, in cases where I know the original data type is what I wanted instead of the new data type that ServiceStudio thinks it should be.