Explain pls. FILED & MODULE in Module Pool

HI Experts,
Pls. clarify one simple doubt in <i><b>Module Pool</b></i>,
Wht is the functionality of,
1) CHAIN & ENDCHAIN
2) FILED & MODULE
thanq.

Hi,
To ensure that one or more PAI modules are only called when several screen fields meet a particular condition, you must combine the calls in the flow logic to form a processing chain. You define processing chains as follows:
CHAIN.
ENDCHAIN.
All flow logic statements between CHAIN and ENDCHAIN belong to a processing chain. The fields in the various FIELD statements are combined, and can be used in shared conditions.
CHAIN.
FIELD: <f1>, <f 2>,...
MODULE <mod1> ON CHAIN-INPUT|CHAIN-REQUEST.
FIELD: <g1>, <g 2>,...
MODULE <mod2> ON CHAIN-INPUT|CHAIN-REQUEST.
ENDCHAIN.
Re: chain-Endchain
When this command is used, all of the fields on the screen that belong to the processing chain (all of the fields listed in the field statements) are made ready for input again. Other fields are not ready for input. Whenever the MODULE statement appears within a processing chain, even if there is only one FIELD attached to it, all of the fields in the chain (not only the affected field) are made ready for input again, allowing the user to enter new values. If the fields in the processing chain are only checked once, the PAI processing continues directly after the FIELD statement, and the preceding modules are not called again.
CHAIN.
FIELD: <f1>, <f 2>,...
MODULE <mod1> ON CHAIN-INPUT|CHAIN-REQUEST.
FIELD: <g1>, <g 2>,...
MODULE <mod2> ON CHAIN-INPUT|CHAIN-REQUEST.
ENDCHAIN.
Check this out
http://help.sap.com/saphelp_nw04/helpdata/en/9f/dbabbd35c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_47x200/helpdata/en/d1/801ca2454211d189710000e8322d00/frameset.htm
check the demo example
DEMO_DYNPRO_FIELD_CHAIN

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    regards,
    vineela.
    Edited by: Radha Vineela Aepuru on Mar 13, 2008 11:12 AM

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  • Use of "Pool Table(s)" in Module Pool Program

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    Thanks,
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    Edited by: kishan P on Nov 14, 2010 7:23 PM

    Hi,
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    Hi Chitra,
    Go to the properties of the filed select program tab and say input required.
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  • How can i display the success msg using module pool

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    Hi,
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  • How to handle The Back button on Module Pool screen

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    hi,
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  • How to use SET & GET Parameters in Module Pool

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    Check the screen attributes for the field. There is an option to show leading zeroes.
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