Impact on existing orders when Customer Ship-To site is associated with Bill-To site

Hi All ,

we are in  EBS R12.2.4.

Currently  in Customer Master Data at Site use level  we have Bill-to , ship-to defined individually

Ex: Customer : XXX

site use level :

Bill-To :  101

Ship -To : 102

ship To doesn't have bill-to directly associated with it .

If  Bill-to  association is established to Ship-to,

ex: Ship-To :102--> 101 or different Bill-to location say 103 , Will it have any impact on the already existing sales order and Invoice creation process?

Defaulting rule for Bill-to is

Ship-to.Bill-To

account .Bill-to

Any pointers  on this is much appreciated .

Thanks .