What is an "on input filed" statements, Computer Engineering

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What is an "on input filed" statements?

ON INPUT

The ABAP/4 module is known as only if a field having the Value other than the initial Value. This initial Value is explained by the filed's Dta Type: blanks for character Fields ,Zeroes for numerics. If the user changes the Fields Value back t o its initial value, ON INPUT does not trigger a call.


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