The extension has 2 different type of repeat region, one static and one dynamic.

The static version require only the number (Quantity) of items you want have in the page, normally you use this behavior in the insert page

The dynamic version require the name of the recodset where you have the details records and is used in the update behavior where you just have a recordset.

Don't use the Dw repeat region because can cause the extension don't work.