customer- Bill TO is differenet on AR invoice

Hi All,

I am having below issue.

On Sales Order header Form , Customer Bill TO is : ABC

But on AR Invoice : its Showing as "XYZ"

Further to my analysis, I found that there exits a "Party relationship" between "ABC" and "XYZ".
But there exits many LOVs so client wants to know why the application is picking XYZ . Is there any setup  for this.
Please guide.

Screen shots attached for your reference.

Thanks,

Regards,

Yogesh