In Form Interface, you must define the fields to be filled by the application program or returned to the application program.
All fields that are recognized by the form as import, export or table parameters through the form interface that implies they come from the application program.
Define the form interface
If an application program calls an SAP Smart Form (or more precisely, the generated function module of the form), there must be a way for the program to communicate with this function module. Data must be passed to the form and further returned by the form to the calling program. All data is exchanged through the form interface. You define the interface in the global settings of the Form Builder. All parameters of the interface are global, which means they are known in all nodes of the form.
The interface of the form/generated function module has the following parameters:
• Import
• Export
• Tables
• Exceptions
Import parameters are read from the application program. There is a number of default parameters and an undefined number of others of any type. Their fields are not ready for input in the interface. All other parameters differ from form to form and contain values provided by the application program, which means basically everything you want to output in the form. They are particularly important for the correct processing of the form.
Import parameters must be typed. To do this, you can use TYPE, LIKE, and (for ABAP Objects) TYPE REF TO - similarly as with the DATA statement of an ABAP program. You can set a default value for import parameters in the Default value field
Export parameters are returned to the application program. Parameter names and the type assignment of import parameters, is also true for the export parameters. If you check Pass value, the value is only passed at the end of the form function module to the parameter in the application program. However, if you do not check Pass value, the value is passed by reference If values are passed by reference, an export parameter is turned into an import export parameter, which means that values can be passed in both
directions.
Tables: You can pass internal tables to the form. For typing, you can refer to a flat table type or (with LIKE) a flat structure type. You can pass nested tables using appropriate export parameters. The values are always passed by reference, which means that value changes in the form directly affect the values of the application program.
Exceptions: Exception parameters are queried in the application program so that the program can respond to errors that occur during form processing.
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Edited by: Manvi Srivastava on Apr 23, 2008 11:11 AM
Edited by: Alvaro Tejada Galindo on Apr 25, 2008 6:04 PM
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