Making a change to one customer name also updates another in AR

Hi All,

I wonder if anyone can shed light on why something is happening in AR as we are at a loss.

Basically we have now on 2 occassions found that we have 2 completely unrelated customers which have no relationship, but if the user makes a change to one of the customers, it changes the other customer name so they are now the same. If you try to change the other back to what it should be, it changes the other one again. This causes a lot of confusion as we do not know what is leading to this.

They have the same Party Number now which is why this is happening but this was never set in the beginning when they were created so we don't know what is causing this.