Use this field level rule to tell the system the field has been mapped in the MASTER.DDT (data definition table) file. Use this rule when you have variable fields which are used on multiple sections.
Instead of mapping these identical variable fields, like Name and Address, each time they are used, you can map them once in the MASTER.DDT file and then map the individual fields to the Master rule. This tells the system to look in the MASTER.DDT file for the complete mapping information for those variable fields.
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