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Data Interfaces

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Screen Technique Overview<br />

© SAP AG<br />

Input<br />

modules<br />

PAI<br />

Output<br />

modules<br />

Dialog step<br />

Input<br />

modules<br />

Output<br />

modules<br />

PBO PAI PBO<br />

Input Processing Input Processing<br />

In an SAP system, dialog and background processing are controlled by screen programs.<br />

A screen program controls one dialog step.<br />

The components of a dialog step are:<br />

A PBO (Process Before Output) event which prepares the screen for output<br />

User input<br />

A PAI (Process After Input) event which processes user input<br />

t

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