SAP ABAP Programming, Functional and Basis Component Reference Books
Example Forms Available in Standard SAP R/3

SF_EXAMPLE_01 
Simple example; invoice with table output of flight booking for one customer

SF_EXAMPLE_02 
Similar to SF_EXAMPLE_01 but with subtotals

SF_EXAMPLE_03 
Similar to SF_EXAMPLE_02, whereby several customers are selected in the application program; the  form is called for each customer and all form outputs are included in an output request
 

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SAP Basis, ABAP Programming and Other IMG Stuff
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