Introduction
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This is the default type when an extractor is created. The extractor takes a source value and copies it in an unchanged form to a target. In the case, the system sets a different rule and you change it to the direct assignment rule, the old rule (include form) with the existing code is deleted.
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If a target field is of a ‘CURR’(currency) data type, the system sets this type of rule automatically by its creation but you may also change or delete it manually.
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In the case that a value in a particular field needs to be changed, deleted or adjusted, you can create your custom ABAP code that will be then processed for selected field during the load. To perform these changes:
Select Routine as a transfer rule and a click 
in the column Edit Rule to access a generated form. The form can be edited in the same way as any Z*/Y* ABAP report. Importing parameter is_record contains the whole record which is processed. This parameter should not be modified. You can change the value of the selected field through the parameter cv_field which modifies the value according to your requirements.
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Skip the records during the extraction process
You have an option to set up a condition to skip records during the extraction process. To perform this, you should set the flag 'gv_skip_line' under your condition.
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