Hey Sam,

The "Works In Progress" section allows In Progress and Completed invoices to be worked on. We find the section a little slow to load and it doesn't hold the current view page number when you dip in and out of Customers.

So we use a self written workspace, using this SQL. 

SELECT invoices.act_id AS ID, invoices.activity_start_time as invoice_date, cust.name AS customer,
MAX(inv_items.activity_start_time) as last_invoice_activity,
SUM(IF(fa.credit,fa.total*-1,fa.total)) as inv_total
FROM acts invoices
LEFT JOIN participations inv_cust ON inv_cust.act_id = invoices.act_id AND inv_cust.arch_short_name = 'participation.customer'
LEFT JOIN entities cust ON cust.entity_id = inv_cust.entity_id AND cust.arch_short_name = 'party.customerperson'
LEFT JOIN act_relationships ar ON ar.source_id = invoices.act_id AND ar.arch_short_name = 'actRelationship.customerAccountInvoiceItem'
LEFT JOIN acts inv_items ON inv_items.act_id = ar.target_id AND ar.arch_short_name = 'actRelationship.customerAccountInvoiceItem'
LEFT JOIN financial_acts as fa ON (fa.financial_act_id = inv_items.act_id)
WHERE (invoices.status = 'IN_PROGRESS' OR invoices.status = 'COMPLETED')
AND invoices.arch_short_name = 'act.customerAccountChargesInvoice'
GROUP BY invoices.act_id
ORDER BY invoice_date

Cheers

Matt