Handling error in data entry screen

Dear experts,
I developed a module pool program which is an entry screen capturing some fields such as matnr,lifnr.
Incase there is a failure to store data on to mseg table using BAPI for movement, i have set a
custom message by using the command as given below :
message id 'ZMB' type 'E' number '002' with errmsg-message.
But when this statement executes ,everything turns grey and user is not able to edit the wrong entry done.
How should i resolve this in way user cannot specify wrong entry and at the same time be able to correct his mistakes.

Hi,
To solve this problem, you have to use the concept of:-
CHAIN.
FIELD : <field_name1>,
          <field_name2>,
          <field_name3>,
          <...and so on>.
    MODULE <module_name>.
ENDCHAIN.
Now when any error message is encountered then the group of fields between the chain-endchain block, are enabled to user (not greyed out). User can now change the enteries in the field.
Use the module <module_name> to write the code initially written in your module.
Revert in case of any queries.
Hope this solves your problem.
Thanks & Regards,
Tarun Gambhir

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Message was edited by:
April King

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Handling error in data entry screen

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