Reference division change

Dear all,

I have a division PR whose reference division is also PR in a particular sales organisation DDDD and dist channel DC.

Now I have changed the reference division to NP.

Now when I try to open previously created sales orders which were created in sales area DDDD / DC / PR, the system is not allowing. It is showing following error: Sold-to-party not maintained for sales area DDDD / DC / NP.

Plz help to resolve this.

Is it advisable to change common division ?

regards