How to use same DFF for two different forms with :BLOCK.field reference

Hi,
Can anyone suggest how to use the same dff in two different forms by using :BLOCK.field reference.
Scenario is the same DFF is referenced by two forms, viz. Form-1 & Form-2.
Form-1 Reference Field is :BLOCK.field name, but the same block is not available in Form-2, which throws an error while opening it.
Any pointers please.
Thanks,

In the environment I currently have access to do not have similar setup.
Let say you setup the DFF1 default value to $HEADER.customer_name, the name of the DFF is CUSTOMER_NAME, description can be anything.
In DFF2, default value should be a SQL, where you can reference the DFF1. For example, SELECT DECODE($FLEX.CUSTOMER_NAME, 'ABC', 1, 'DEF', 2, NULL) FROM dual
In this case, you can reference the DFF1.

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How to use same DFF for two different forms with :BLOCK.field reference

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