Billing Print Issue

A Billing user is trying to print some invoices through the following page:

Billing -> Generate Invoices -> Non-Consolidated -> Finalize and Print Invoices

The Run Control Page shows that the invoices are going to be picked up through the "Bills to be Processed" icon.

A job is then launched on the process monitor that runs the following processes:

BIIVC000 - Pre-process & Finalization

BI_IVCEXT - Invoice Extract Process

BICPJ00 - Print Crystal Invoice (Sub Process BIPRNT00 - CRYSTAL - Invoice)

The BIIVC000 process appears to select the Bills for processing but the last two processes (BI_IVCEXT and BICPJ00) don't pick up anything and the invoice pdf's aren't produced.