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Field
Assignments 
A collection of rules that define how the field contents are to be converted during data migration from the legacy system to the SAP system.
The field assignments use placeholders and conversion rules in order to ensure both flexibility and consistency of data. In migration customizing, you assign values to the placeholders and select the processing types for the conversion rules.
The field assignments are distinguished by the different levels of reference:
· At the highest level, there is the domain, which is defined by the field type, field length, and value tables, or by means of fixed values.
· At the second level, there are the data elements, which are defined by the domain as well as by language-dependent texts.
· At the lowest level, there are the fields, which are defined by field names and data elements. The field-related rules refer to them.
The placeholders and conversion rules defined by the field assignments are either linked to the target field directly or through the domain.