why in create nonlabor cost we have the field , but not the original transaction reference?

Summary:

why in the adfi " create nonlabor cost" we have the field "Unmatched Negative Item" , but not the original transaction reference?

If we need to reverse a cost and link it to the original cost using this adfi ,we are not able to do so .

While on adfi from third party and on fbdi ,the field exists .

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