Trying to set up writeback from Staircase to CS is a fairly frustrating process. You have to create the field in CS first, which makes sense, but you don’t actually know the data type of the field you need to make, until you set up the mapping. In Staircase (where you set the sync) all you see is this:
After you select a field, just the mapping. You don’t see the types until after the mapping is done, which is super out of order. I created one thinking it was a string, turned out to be a number.
Please surface data types to help make mapping easier.