How to fetch Fusion dff attribute value in an EL (Expression language) expression

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How to fetch Fusion dff attribute value in an EL (Expression language) expression

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We have a requirement to embed an external link on Fusion AR Invoice page. One of the parameter used in the link is coming from the DFF attribute. Tried below expressions to fetch the value for dff attribute but it's not working:

#{bindings.attributeapiname.inputValue}

#{pageFlowScope.attributeapiname}

How to fetch the dff attribute in EL expression.

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