Resolving issues after changing a data type of you...
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In this video I show you the most important steps you have to do when you change a data type after the UI generation. In case you need to change the data type of an already active business object you need to do the following:
Clean the already existing data in your database
Update the model in the UI's so that they work again correctly
Please note, the above steps are only possible if your solution is not yet assembled / deployed to production. In that case you cannot change a data type but must create a new field with the right data type and eventually perform a "mini migration" between those two fields.