Multiple levels of functional maps

Functional maps can have multiple levels of subsequent functional maps.

For example, you can use two levels of functional maps with an input of multiple purchase orders that must output multiple invoices. In this case, there is a one-to-one relationship between an input purchase order (PO) and an output invoice, which indicates the need for a functional map that can generate one output invoice for each input PO.

In BatchMap, the map rule on the Invoice(s) output data object references the map POToInvoice. The input argument of POToInvoice is PO:POBatch. This ensures that one invoice is generated for each PO.

Although this example only uses two levels, the number of levels of functional maps you can use within a functional map is unlimited.