First, you can add parameters only to field mapping and conversion program. In the tree view of field mapping and conversion rules open Layout dialog box (Extras -> Layout) and check flags 'Global Data Definitions', 'Processing Time Periods', and 'Form Routines'. After clicking OK you'll see new tree nodes, such as: __GLOBAL_DATA__, __BEGIN_OF_PROCESSING__, and __BEGIN_OF_TRANSACTION__. By double clicking on such a node you'll enter text editor, where you can type ABAP code. You can put parameters into the __GLOBAL_DATA__ node. I'm afraid you cannot use text symbols there (I mean those of form <b>text-001</b>). You can use literals instead.
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