Creating checktable for custom table field

Hello Guys,
Can anybody explain me steps involved in createing a check table for the field in
ztable.if possible can u send me link with screen shots.
your help will be greatly appreciated.
Regards
Janapathi

Check table
check table and value table
For example you have Employee master table & Employee Transaction table.
When ever an employee Transacts we need to check whether that employee exists , so we can refer to the employee master table.
This is nothing but a Parent & Child relationship . Here data can be maintained at client level , no development involved.
As per DBMS what we call foregin key table, is called as check table in SAP.
1. The contents of the check will be used as an input help(F4 Help) for a particular field on which a check table is assigned.
But the contents of Value Table are never used in Input Help.
The Heirarchy which decides from where to used the Input Help is:
1. Input help defined explicitly in ABAP Program or Dialog Module.
2. Input Help Attached to the referenced Database Table field.
3. Using the contents of Check Table as an input help if neither (1) or (2) help are there.
4. Input help from Fixed value or Value range given in Domain.
Check Table: The ABAP Dictionary allows you to define relationships between tables using foreign keys . A dependent table is called a foreign key table, and the referenced table is called the check table. Each key field of the check table corresponds to a field in the foreign key table. These fields are called foreign key fields. One of the foreign key fields is designated as the check field for checking the validity of values. The key fields of the check table can serve as input help for the check field.
Value Table: Prior to Release 4.0, it was possible to use the value table of a domain to provide input help. This is no longer possible, primarily because unexpected results could occur if the value table had more than one key field. It was not possible to restrict the other key fields, which meant that the environment of the field was not considered, as is normal with check tables.
In cases where this kind of value help was appropriate, you can reconstruct it by creating a search help for the data elements that use the domain in question, and using the value table as the selection method.
Check table will be at field level checking.
Value table will be at domain level checking ex: scarr table is check table for carrid.
also refer
http://help.sap.com/saphelp_nw2004s/helpdata/en/e2/667092730811d2959500a0c929b3c3/content.htm
http://www.abapmaster.com/cgi-bin/SAP-ABAP-interview-questions.cgi
Re: check table and Value table

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                        ID name2 FIELD f2
                        ID namen FIELD fn.
object is the name of an authorization object. With name1, name2 ... , and so on, you must list all fields of the authorization object object. With f1, f2 ... , and so on, you must specify the values that the system is to check against the entries in the relevant authorization of the user master record. The AUTHORITY-CHECK statement searches for the specified object in the user profile and checks the useru2019s authorizations for all values of f1, f2 ... . You can avoid checking a field name1, name2 ... by replacing FIELD f1 FIELD f2 with DUMMY.
After the FIELD addition, you can only specify an elementary field, not a selection table. However, there are function modules available that execute the AUTHORITY-CHECK statement for all values of selection tables. The AUTHORITY-CHECK statement is supported by a statement pattern.
Only if the user has all authorizations, is the return value sy-subrc of the AUTHORITY-CHECK statement set to 0. The most important return values are:
·        0: The user has an authorization for all specified values.
·        4: The user does not have the authorization.
·        8: The number of specified fields is incorrect.
·        12: The specified authorization object does not exist.
A list of all possible return values is available in the ABAP keyword documentation. The content of sy-subrc has to be closely examined to ascertain the result of the authorization check and react accordingly.
REPORT demo_authorithy_check.
PARAMETERS pa_carr LIKE sflight-carrid.
DATA wa_flights LIKE demo_focc.
AT SELECTION-SCREEN.
AUTHORITY-CHECK OBJECT 'S_CARRID'
                  ID 'CARRID' FIELD pa_carr
                  ID 'ACTVT' FIELD '03'.
IF sy-subrc = 4.
    MESSAGE e045(sabapdocu) WITH pa_carr.
ELSEIF sy-subrc <> 0.
    MESSAGE e184(sabapdocu) WITH text-010.
ENDIF.
START-OF-SELECTION.
SELECT carrid connid fldate seatsmax seatsocc
    FROM sflight
    INTO CORRESPONDING FIELDS OF wa_flights
    WHERE carrid = pa_carr.
    WRITE: / wa_flights-carrid,
             wa_flights-connid,
             wa_flights-fldate,
             wa_flights-seatsmax,
             wa_flights-seatsocc.
ENDSELECT.
Regards
Hitesh

Creating checktable for custom table field

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