Eric Erhardt has posted part 2 in his series on using stored procedures in LightSwitch. In the second part, he describes how you can use Visual Studio LightSwitch to update database records using stored procedures. A lot of database administrators only allow modifications to data through stored procedures. Using this simple approach, you can easily create a LightSwitch application that uses stored procedures to modify data.
The blog post is here – Updating Records in LightSwitch using Stored Procedures.