How to migrate Requisition approval rule from one instance to another?

Summary:

We have a requirement where we need to migrate requisition approval rules from one instance to another instance using SOA composer. But after importing the approval rules in the destination instance when we are using the "Edit rules in BPM" button to synchronize the rules in FSM then we are getting an error as shown in below screenshot.

We are using the user-defined attributes in most of our rules. So, we cannot delete it.

Is there a workaround for this?

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