I understand that switching between companies when the "first day of the week" does not correspond is impossible. My question is why??? It seems like an arbitrary rule Baan made up. Is there a good reason for it?

Steve,

I am guessing this might be the answer to the issue -

Multiple date formats & currency formats by user (http://www.baanboard.com/baanboard/showthread.php?s=&threadid=6925&highlight=time+format)