Define workflows before you start authoring solutions. Once you start creating solutions, you create assets that reference solution project workflows. These assets will continue to use the original workflows. You cannot edit these workflows but must instead clone them. It is simpler and less error prone to define your workflows before you start creating solution assets.

Similarly, it is less error prone to define your solution classes before you start creating solutions. This will ensure that all of your solutions are consistent including populating all required properties defined in the solution class.