What does it mean that the allowable values for certain data points in the ULDD are different?

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What does it mean that the allowable values for certain data points in the ULDD are different?

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Based on each GSE’s credit policy and delivery eligibility, there are certain data points that have different expected and allowable values or enumerations. The details in the GSE-specific Implementation Guides for Loan Delivery Data will provide the information needed to code these data points with the GSE-specific values. The data points within the ULDD also have varying levels of conditionality – some are required for both GSEs, some are conditionally required (such ARM data attributes), and some are conditionally independent (such as pool data for Fannie Mae only). The basic framework of the file is the same and the hierarchical structure of the containers that define specified collections of loan data points within the file is the same.