Hi,
The Receivables Transaction Inquiry - Customer window is actually a window for Receivables Management.
Since the Invoicing and Sales Order Processing modules flow into RM, any transaction posted on IVC and SOP will show here are OPEN (RM20101 - RM Open File). Once these transactions are fully applied and Paid Transaction Removal is processed, the transactions will then move to HIST (RM30101 - RM History File).
The Inquiry you need to use for Sales Order Processing transactions is the Sales Order Processing Document Inquiry window (Inquiry | Sales | Sales Documents). This holds Unposted and Historical (posted) transactions.
For the Smartlist you are to create (using SLB), you just need to check SOP10200 (Sales Transactions Amounts Work) and SOP30300 (Sales Transactions Amounts History) and then link the SOP10201 (Sales Serial/Lot Work and History).
Let me know if you have further questions.