How to find out header.attribute and line .attribute values for each page while defining Groovy

Summary:

How to find out header.attribute and line .attribute values for each page while defining Groovy script in OM extension

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We are defining to make return reason field as required field through OM extension, but couldnot find the right attribute line.getAttribute("ReturnReason"), how to get all the attributes from the page, is there any SQL query?

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