InfoPath Dev

Hello, I need to create Form that displays Name: (drop-down list) ID (drop-down list) People (people picker) Initial date (date picker)/ End Date (date picker)/  Classroom (drop-down list) And in this part to get a repeat box for the last 3 fields. The issue is that every time I create a new table or try to put the name ...

I have a SharePoint Custom List, that manages classrooms and the time when they are used (pretty much it schedules classes) and I need to validate that the classroom is not used on the time that is submitted. The form has the following fields: -Start, End (date and time type of data) -Classroom (Drop down list) So, I need a rule on the ...