Including data post-filtering

Question

Hi all:
I have a database table named ORDERS that contains repair order data and invoice data. Each record has an ORDERTYPE (i.e. INVOICE or REPAIR) and all invoice records have a system-generated ORDERID that links them to the repair orders (called the REFORDERID). 
I have a second database table called ORDERLN that contains all individual line items for the repair orders and invoices. I need to access this data selectively to retrieve sales and cost information. 
All tables currently have inner joins not enforced.
The data lines for repair orders and invoices are separate in the ORDERLN table and have to be linked via ORDERIDs.  There may be several lines for one repair order or invoice (part data, labor data, comments, etc).  The repair orders have their own line items with COST data and the invoices have their own line items with SALES data.
I need to limit my selected report data by the invoice closed date, which is contained in the ORDERS table. So the problem arises here where I need to include INVOICETYPE="invoice" within a date range, then the repair orders (also in the ORDERS table) get dropped.  I need these repair order IDs to access their corresponding cost information in the ORDERLN table.  The only data point i have to link the invoice and repair order in the ORDER table is via the REFORDERID -- see the image I attached.
I need a way to first restrict the invoice type and close date, then use the REFORDERID on those data records to pull in the associated repair orders (these would already be closed orders). 
I have all the sales data in my report working, displaying sales by part and invoice order ID. However, I can't get the part cost data for the repair order line items to display because the REFORDERID (in the ORDERS table) is nested within each invoice record. If I don't limit the data by invoicetype="invoice" I can get the cost data to work; however, I need to filter the whole dataset by invoice closed date.
Can anyone guide me either with record selection formulas or SQL queries?

Answer 1

This is really not that difficult because Crystal will let you "alias" tables.  For example, in the Database Expert, you would add a second copy of your ORDERS table.  Crystal will tell you the table already exists and ask if you want to add an alias.  The table will then be added as ORDERS_1.  To prevent confusion, I would then select ORDERS_1 on the right of the screen, press F2, and rename it to REPAIRS.  Do the same thing with ORDERS and name it INVOICES.  You would then link from INVOICES to REPAIRS on the Order ID (or whatever field joins invoices to repair records).  In the Select Expert you would add something like the following criteria:
{INVOICES.INVOICETYPE} = 'invoice' and
{REPAIRS.INVOICETYPE} = 'repair'
To get the line items, you would also add another copy of your ORDERLN table.  To link things together, you would have the invoices table link to one copy of ORDERLN and the repairs table link to the other copy.   The picture below shows how the tables join together.
-Dell