Pricing proce for Returnable packaging mill product

Friends,

InMill product, SAP.HELP.COM it has been mentioned that there is stand pricing procedure for Returnable packaging. However I am unable to find it. please check the following statements.

The standard system includes pricing procedure J1NA01. Condition types J1N7 (returnable packaging value) and J1N8 (refund returnable packaging), and order types JGL and JLL are shipped at the same time.

Ple guide.

Thanks