RE: [ubl-ndrsc] Rule: 81 Extending

> [R 81]  A UBL message set may be extended where desirable if the business
> function of the UBL original is retained., but the message exists within its
> own business context. 


Recommend: A UBL message set may only be extended if the business function of the UBL original is retained., and the message exists within its own business context. 

MikeG