Note 395772 - Negative delivery costs in returns items

HI Gurus,

I want to put delivery costs in return PO. But system not allowing to put negative delivery costs.

I found 3 notes for this issue.

1) Note-395722-Negative delivery costs in returns items

2) 646941 ME21N Possible to enter negative delivery costs

3) 368076 Entry of negative delivery costs is possible.

If I apply any of these notes will solve my problem?

Will it work?

How to apply notes?

Please suggest me to go further.

Thanks and regards

Ramesh Reddy