How to pass value to User Defined Attributes in Cost Accounting Sales Order Issue Event Class

Summary:

In the source assignments for "Sales Order Issue" event class, there are 10 "User Defined Attribute1-10". How can we pass value into those User Defined Attributes?

We need to be able to copy Order EFF/Line EFF values to Sales Order Issue source assignments for "return only" RMA recognition. Can that be done using "User defined Attributes"? Our Order EFF/Line EFF are from external billing system and RMA gain loss account derivation is relying on some of those values.

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24C

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