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March-2005

Automatic Screen Field Checks

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Objectives

The participants will be able to:

Recognize which Automatic Screen Checks occur on all fields vs. dictionary fields.

Understand the timing of automatic checks.

Understand the process of required field check, field format check, foreign key check

and valid value check.

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Automatic Checks

Values in all

input/output

templates are

checked for

Values in

input/outputtemplates painted

from the ABAP

Dictionary are

checked for

Required Field Entered?

Proper Format?

Foreign Key Value?

Valid Value?

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Timing of Automatic Checks

SCREEN PROCESS BEFORE OUTPUT.

PROCESS AFTER INPUT.

MODULE ONE.

MODULE TWO.

YESNO

Module ONE

executed.

Module TWO

executed.Go to PBO of

next screen

Data transport from

screen fields to

program fields with thesame names.

Automatic

Screen Field

Checks OK?

Enter

As soon as the user triggers a screens PAI event, the system performs itsautomatic checks.

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Required Field Check

Fields can be marked as

required two ways: (1) use a

question mark ? as the first

character of an input/output

template or (2) check on the

field attribute for required entry.

If a required field is not

entered, the system will

display the error message:

Make an entry in all required

fields.

Enter

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Field Format Check

The AAYEAR field in the

YMOVIE table has the NUMC

(numeric character) data type.

The system will automatically

check that the user has entered

all numbers in this field.

If a field format is incorrect,

the system will display an

appropriate error message.

Enter

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Foreign Key Check

Address Information

Customer # C32

E: Entry C32 does not exist (please check your entry)

Address Information

Customer # C32

This customer number field

painted from the ABAP

Dictionary has a foreign key

relationship maintained.

Because of this relationship,

you will see a drop-down arrow

to get a list of possible values

(F4).

If the value entered does not exist in the foreign key (check) table, the system

will display the error message: Entry does not exist (check your entry).

Enter

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Valid Value Check

Academy Awards

Year

Category

2005

PI

E: Please enter a valid value

Academy Awards

Year

Category

2005

PI

The CATEGORY field in the

YMOVIE table points to a

domain with a set of valid

values. Because of this set of

valid values, you will see adrop-down arrow to get a list of

possible values (F4).

If a valid value is not

entered, the system will

display the error message:

Please enter a valid value.

Enter

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Demonstration

Creation of an online program which displays the screen ( referring to theYMOVIE table ) created in the previous chapter.

Demonstration of the various automatic screen checks in this screen.

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Practice

Creation of an online program which displays the screen ( referring to theYMOVIE table ) created in the previous chapter.

Demonstration of the various automatic screen checks in this screen.

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Summary

The values entered into input/output templates are automatically checked by thesystem.

As soon as the user triggers a screens PAI event, the system performs its

automatic checks.

If a field is marked as required, there will be a question mark in the input/output

template and the system will automatically check that the user entered a value inthe field.

When you paint input/output templates on the screen, the fields have a

corresponding data type (format) associated with them. If an incorrect format is

entered, the system will display an appropriate error message.

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Summary (Contd.)

If a foreign key relationship is maintained for a field, the system will automaticallycheck to see if the value entered exists in the foreign key (check) table.

If valid values are maintained at the domain level for a field, the system will

automatically check to see if the value entered is one of the valid values.

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Questions

What are the different automatic screen checks available in a screen ?

Does Foreign Key checks happen automatically for screen-fields referring to a

check table ?

When does the system performs its automatic checks ?