I'm trying to calculate 60 days before a date captured by the user to create a reminder. I'm using the Formula in the Business Process but I cannot make it work, I see the following error: Formula value error: Cannot convert type "Int32" to "Entity"
It looks like it's an issue with trying to set the parameter you've selected to the value of the formula - what is the type of the parameter? It should be an integer based on the formula shown, which will be returning the day of the month 60 days before the Fecha de Lanzamiento date.
We tried to check the behavior. It looks like the problem lies in expression because you are using .Day at the end. We were able to successfully subtract -60 days simply by using the .AddDays(-60) method. [#read contact.First item of resulting collection.Birth date#].AddDays(-60)