MODULE POOL FIELD VALIDATION

       MODULE POOL FIELD VALIDATION USING CHAIN   & 

                         DIRECT VALUE VALIDATION.

Module pool fields can be validated by many ways , if you have one field that is to be validated , you can validated either using direct table selection or by validating on PAI.

If you have multiple fields then simply you can validate using CHAIN & ENDCHAIN Method.

code is  as:

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********************validating directly  using table selection *******************

FIELD  scr_field-matnr 

  SELECT * FROM 

MARA WHERE MATNR = SCR_FIELD-MATNR 

WHENEVER NOT FOUND SEND ERRORMESSAGE  001 ON 

INPUT.

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2nd way:

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***VALIDATING FIELD ON PAI 

FIELD   scr_field-matnr .

MODULE field_validation  ON INPUT.
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3rd way:
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********************validating using chain and endchain method *************************
CHAIN .

FIELD: SCR_FIELD-MATNR , SCR_FIELD -MAKTX.
MODULE FIELD_VALIDATION.
ENDCHAIN.

**********In the module write your logic as per requirement*************
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